What dpi to scan photos?

Am about to scan lots of still photos into iPhoto. My scanner has a default setting of 200 DPI. I can go higher or lower than 200 and recognise there is a trade between quality and size. What sizes do others use to scan photos? Any learnings or tips welcome.
Thank you.

What's your ultimate aim?
A rule of thumb is that printing requires 300 dpi, web use about 100.
Regards
TD

Similar Messages

What resolution to scan photos for viewing in Premiere?

I am currently undertaking a documentary and will be using a lot of still photographs that I want to pan and zoom with.. I am scanning the photos at 400dpi and you can go in quite close in Photoshop with no distortion but in Premiere it has no resolution at all?? When I bump up the dpi to 1200 it says the image is too big to bring into Premiere... So before I go scanning my hundreds of photos I need to sort out this problem..
Probably something really simple but can anyone help me???

The max size for Premiere Pro is 4096X4096 if I remember correctly.
If you want to scan larger than that, you can pick the best part of the image and use Photoshop to scale it down.
Or, use After Effects to do the zoom in, since AE can handle 30,000X30,000 IIRC.
You might even find Photoshop Extended's timeline sufficient for zooming (although no "easy ease" is available to my knowledge).

What is the ideal configuration when scanning photos for iMovie?

When scanning photos to use in iMovie, what is the best dpi resolution? 72 dpi, 100 dpi, 150 dpi, 300 dpi?
What is the best print size? Scan it at 8 inches, 10 inches, 12 inches?
When saving to jpg, what quality is best to save at? 8, 10, 12?
Any help would be appreciated!

DPI (dots per inch) are only used when printing and iMovie will only look at the file dimensions.
But scanning images takes a lot of time and you may want to use the same images in other software so you should make the settings appropriate for future printing.
Scan (always in "landscape mode") using settings appropriate for printing (300 dpi) and sized for the largest prints you may want to make. TIFF is much less compressed than JPEG. Bring these files in iPhoto and export them out as JPEG sized at 640X480 for use in iMovie.

What is the easiest way to get scanned photos from MP Navigator to iPhoto? I thought last time I did this I could highlight and drag into iPhoto?

What is the easiest way to get scanned photos from MP Navigator into IPhoto? I cannot highlight and drag/drop.

Contact the manufacturer (Canon?).

Scanning a 35 mm slide - what dpi to use?

What dpi should I scan a 35mm slide to produce a good image, via idvd, to a 36 inch television?

I suggest you read: Preparing images for DVD slideshows at http://docs.info.apple.com/article.html?path=iDVD/6.0/en/17.html
If you intent to produce a standard format NTSC DVD, you should have 720x540 pixels so you should scan at 540 ppi (say 600 ppi). This will give you a roughly 900x600 pixel image. (The DVD image is in a 4:3 ratio and your slides are in a 3:2 ratio.)
Keep in mind that if you are planning to view the slideshow on a TV set, you will not see the edges of the image due to a TV set ovescan. You can select 'Scale slides to TV safe area' in Preference>Slideshow. If you do this, your slides will have a black border when viewed on a computer monitor.

What DPI should I have photos at for iPad?

I understand the ideal resolution for photos on the iPad is 1024x768. What DPI should I save them at for the optimal display quality?

But it won't make a large file size smaller right?
If your files are managed by iPhoto or Aperture on a Mac, then yes it will. You need only compare the storage space allocated for your iPad photos against the storage space required for the original photos in the managing application. For example, I have 3 April Aperture albums currently installed on my iPad. On the iPad they require a bit more than 200 MBs of space. The original files that remain stored on my hard drive by Aperture take up 600 MBs of space. The amount of storage space saved will depend on the format and dimensions of the original files. I.e., the less compressed and larger the original file, the more space you will save during this automated optimization by iTunes as it syncs the content. Conversely, the smaller and more compressed the files you sync via iTunes, the less savings your will realize until you reach a point where no optimization takes place and the iPad file is the same as the original file. I don't think we can explain this in any simpler terms here.
As to the dpi vs. ppi (and/or lpi for that matter), I assume the poster was left-handedly attempting to point out that the terms have somewhat technical differences and should be applied more judiciously with respect to the medium or device to which you are making your reference. However, most of us did realize what you were trying/meant to say.

Scan photo prints to iPhoto

I have a lot of photo prints taken on old-fashioned film, before the days of digital.
I have an HP Photosmart 5520 scanner/printer which has an option for Photo Preset. The default 'Resolution' setting is 200ppi. There are other options for 75,100,300,600,1200 or 2400 ppi.
My first question is, which 'Resolution' setting should I choose ?
The scanned size at 200 ppi for one print is 2.74MB. When sent to iPhoto its size is reduced to 1MB.
Another apparent anomaly is that although the prints are all 6 inches x 4 inches, their 'info' in iPhoto can vary from anything between 1184 x 791 to 2292 x 1498, and in size from 322 KB to 985 KB.
The digital photos I already have in iPhoto, nevertheless, are all 3888 x 2592 ; but the sizes vary eg from 3.4 MB to 6.1 MB.
File > 'Get Info' for the scanned photos says they are JPEG images and 'color space' is RGB, which I understand is the requisite . . . Can the foregoing re scanned and digital photos be explained ?
Thanks in anticipation

My first question is, which 'Resolution' setting should I choose ?
Depends entirely what you're going to be doing with the Photos. Jpeg is a lossy format, so as you edit each time you save some data is lost. If they require intensive editing, then the more data the better. Are you going to print them? Depending on your devices and the quality you hope to achieve, then perhaps the old 300 dpi for printing is a reasonable rule-of-thumb. If you're uploading them to the internet, say flickr or whatever, then 100 is fine. So, it depends on your proposed usage.
The scanned size at 200 ppi for one print is 2.74MB. When sent to iPhoto its size is reduced to 1MB
iPhoto doesn't reduce the size of anything on import. Where are you seeing these sizes mentioned?
Another apparent anomaly is that although the prints are all 6 inches x 4 inches, their 'info' in iPhoto can vary from anything between 1184 x 791 to 2292 x 1498, and in size from 322 KB to 985 KB.
No anomaly here. Your computer has no "inches" everything is measured in pixels. So the fact that an image is 6x4 in the real world is of no relevance. What matters is the pixel dimensions you choose to digitise (or scan) it. You can create a scan of you 6 x 4 that will be 600 x 400 pixels. (@100dpi) Or you can as easily create one the will be 14,400 x 9,600 (@2,400 dpi)... In other words, don't expect a direct correlation between what you hold in your hand and what you make on the screen. They're different worlds...
But again, iPhoto doesn't change anything on import, so I'd be looking at the scanner for explanations of these variations.
As to the file size, remember not all pixels are the same. An image that is pure white or pure black will have a smaller file size than one of a richly coloured sunset, and will also depend onn the resolution you scan at - so again, no direct correlation, it's a complex equation.

Best format for importing scanned photos into FCP in HDV?

Hi,
I'm importing a lot of scanned photos into FCP, for an HDV project. I will be zooming into these images, panning, and so on.
What is the consensus on the best format to use? I was thinking TIFF but then reading about PNG I am thinking this is perhaps better.
I am dealing with large (up to 1200 dpi) image files, so size is an issue.
Many thanks for your thoughts.

Right, use a PSD with photos on different layers, Import the one document into FCP, each photo is on a different layer in FCP and you can zoom in as you wish by using key frames, once you set all your photos (Layers) the way you want all the same or different etc... you copy and paste them into the time line. I do this all the time and add transitions or effects. works well even with company logos off of a web site. You can zoom in all you want. dude
from a link you provided
PSD
Increasingly then image editability is becoming important. The obvious way of maintaining maximum information and maximum editability is to stick with the native application-specific format. Of course it was to avoid this go-it-alone anarchy that file format standards had to be developed in the first place, but the situation with bitmap images is quite special. Currently the vast majority of designers are working on their images in Photoshop and then exporting them to TIFF to use in their DTP application. Why not just cut out the middleman and support the industry standard Photoshop’s PSD format directly?
After all the format is well known. The core format PSD 3.0 format is built on a short header specifying the image size and colour channels and then three information sections called the Colour Mode Data Block, Image Resources Block and Layer and Mask Information Block defining features such as duotone settings, channels and paths and layer opacity and blend mode respectively. After that comes the image data. Naturally the PSD format can support all the advanced features we’ve already looked at such as duotones, clipping paths and channels but it also offers one feature that no other file format does. While every other format must be flattened on export, PSD is the only format that supports layers. Any program that supports PSDs directly can then leverage this layer information as Adobe ImageReady and Deneba Canvas show. Currently the DTP support is fairly basic but the possibility of changing image blend modes or editing layer text or tweaking adjustment layers depending on the actual spread in which the image appears is creatively mouthwatering.

Trying to scan photos from my photo album to a folder on my desktop. Have been trying to figure out for over an hour. Seems very complicated and cumbersome, Can you help?

Trying to scan photos from my photo album to a folder on my desktop. Have been trying to figure out for hours. Seems very complicated and cumbersome. Can anyone help? It's got to be much quicker (fewer key strokes) and simpler than what I've been able to discover.

Open the file, parse it, populate an ArrayCollection or XMLListCollection, and make the collection the DataGrid dataProvider:
http://livedocs.adobe.com/flex/3/html/help.html?content=Filesystem_08.html
http://livedocs.adobe.com/flex/3/html/help.html?content=12_Using_Regular_Expressions_01.ht ml
http://livedocs.adobe.com/flex/3/html/help.html?content=dpcontrols_6.html
http://livedocs.adobe.com/flex/3/langref/mx/collections/ArrayCollection.html
http://livedocs.adobe.com/flex/3/langref/mx/collections/XMLListCollection.html
If this post answered your question or helped, please mark it as such.

How do i find out the DPI of a photo ?

i want to enter a photo in a 'contest' ... the rule is that the photo has to be at least 300 DPI ....
how do i determine what DPI my photo is ?
i have iPhoto 9.2.3
thank you
Donna

how do i find out the DPI of my photo ?
A digital image has no dpi, unless you print it. What is the pixel size of your photo? Select your photo in iPhoto and open the Info pane.
It will show you the width and height of your photo in pixel below the name of the camera; in the example above the image is 3000 pixels wide. Printed at 300 dpi it will be 10 inches wide. You need to know, how large the calendar is supposed to be printed, to see, if your photo has enough pixels.
How many pixels - width and height - does your photo have?

Can't Import Scanned Photos

I have scanned about 100 snap shots from the original photo prints. All are saved in .JPG format. When I try to drag these photos to my iPhoto library, a message appears advising that the files are unreadable (may be unrecognized file type or may not contain valid data).
I'm puzzled. As I said, I saved them as jpeg files ...
Thanks for any help.
G5 iMac Rev B, 2Gb RAM, 400 Gb HD, iPod 20 Gb Mac OS X (10.4.3)

I know it can be confusing working with a new operating system so don't be frustrated. iPhoto works a little differently than what you are used to. Photos must be imported into iPhoto in order for iPhoto to see them. That is why when you scan photos and save them in the iPhoto Library folder they do not show up in iPhoto. The photos must be scanned and saved to a folder OTHER than the iPhoto Library folder. Once saved, they then can be dragged into an open iPhoto Library viewing window (iPhoto is open and you are viewing your photos in the library window) to import, or use the menu command of File>add to library from the menu bar. Once imported/copied into iPhoto you can then delete the scanned photos from the folder you saved them too.
Now, I am wondering how you chose that folder path to save the scanned photos too? Did you navigate to the Pictures/iPhoto Library/Originals/2007/roll110 folder and choose that folder to save them too?
Anyway, navigate back to that folder and drag the scanned photos to the desktop. Open iPhoto and import the photos on the desktop.
Since you are new to the Mac and iPhoto I have a little more info to help you out with iPhoto.
--First thing to know and remember is this...Do not drag any images, folder of images into the iPhoto Library in the Finder. Images have to be imported into iPhoto within the application. Do not scan images and save them into the iPhoto Library folder in the Finder. Save them to another location such as the Pictures folder or even the desktop. You can then import them into iPhoto.
If you have already put files/folders in the iPhoto Library folder in the Finder then you will also find out that if you try to import them into iPhoto you will get an error message. No worry, just drag them to the desktop and import from there.
--All images that you import are shown in the library view. You can choose how you want to view, by rolls, by date, by rating, etc. When you put images in an Album, slideshow, book, etc, you are actually just putting pointers to those images in the library. You are not adding more images. If you delete an image from the Album it will still be in the library. If you delete an image from the library it is deleted from iPhoto's database (the iPhoto Library folder in the Finder) and your hard drive ONLY after you empty iPhoto's trash. (unless you have it backed up somewhere else)
--You have a folder of images on your hard drive and want to import them into iPhoto. Drag the folder of images into an open iPhoto Library window and the folder of photos will be copied into the library, resulting in a new roll with the name of the folder. You now have two copies of those photos, the ones in iPhoto's database and the ones on your desktop. You can keep the ones on your desktop that you just imported as backup or you can delete that folder. You can also drag a folder of photos into an empty space in the source column and a new roll and album will be created at the smae time for those images in the folder. The album will have the same name as the folder you dragged into the source column.
-- you scan a picture/pictures and save it in a folder. You cannot scan directly into iPhoto or the iPhoto Library folder in the Finder.
You want all your photos in iPhoto so you import them into iPhoto.
Now you have two copies of that picture/pictures, so you can delete the originals that were in the scanned folder and keep the one/ones that were imported into iPhoto.
-- You download pictures from your camera into iPhoto.
There is now one copy of each of the pictures. (DO NOT HAVE IPHOTO DELETE THE IMAGES FROM YOUR CAMERA! DELETE THEM MANUALLY WITH THE CAMERA-if something goes wrong with the import and they are never imported and then they are deleted from the camera you might end up losing those images)
--You want to change something about a picture you imported, such as
cropping it or changing the size, or changing the orientation.
Once you do that to a picture, you now have two copies of the picture
in iPhoto, the original and the edited one. The edited one will be in the library organize view. The original is packed away in an Original folder in your iPhoto Library folder under the date of the roll. You can always revert to the original by control clicking on the photo and choose "revert to orginal" You will not have this choice if you used iPhoto Diet to get rid of the Originals.
(a quick note on cropping within iPhoto...when you are in edit mode, you automatically will be in the crop mode with cross hairs to highlight the crop area. To finish cropping you must click the crop button and then go back to library view and your cropped picture will be there.
--You want to use Photoshop or another graphic program to edit a picture in your iPhoto library.
You can open up prefs for iPhoto and choose
For iPhoto 5--"when double clicking on
photo" ..do" choose "other" and select Photoshop. Now you can edit all
pictures in your iPhoto library in PhotoShop by double clicking. If you save the photo with the same name and as a flattened file it will be saved right into iPhoto and you will see the changes. If you don't want to save it into iPhoto then do a "save as" and save to the desktop. You will then have the original photo still in iPhoto and your new edited photo on the desktop.
For iPhoto 6 (from the Apple Help Menu)-Have you ever used PS as the external editor set up within iPhoto Prefs?
From the iPhoto Help menu;
"Choosing what happens when you click the Edit button
When you want to edit a photo, you can have the photo open in iPhoto's edit view, in a separate window, in full-screen view, or in another application.
To choose a preference:
Choose iPhoto > Preferences.
Click General at the top of the Preferences window.
Under Edit Photo, select one of the following options:
"In main window" opens the photo in the main viewing area.
"In separate window" opens the photo in a separate window.
"Using full screen" opens the photo in full-screen view.
"In application" opens the photo in another application you choose.
To open a photo in its own window when "Main window" is selected, press the Option key when double-clicking the photo.
To open a photo in edit view when "Separate window" is selected, press the Option key when double-clicking the photo.
Note: Any video clip you imported into iPhoto will always open in QuickTime Player when you double-click it."
And...
"Editing photos in another application
You can do many editing tasks in iPhoto, such as rotating and cropping a photo, changing a color photo to black and white, adjusting exposure and contrast, and reducing red-eye. If you want to make other changes to a photo, you can open it in another image-editing application, such as Adobe Photoshop.
To edit photos in another application:
Set your preferences to open photos in another application when you double-click them or click the Edit button. (See Related Topics below.)
Double-click the photo to open it in the application.
Edit the photo and save it using the same name and file format.
The changes you made to the photo will be visible when you return to iPhoto.
IMPORTANT: When you double-click a RAW-format photo, iPhoto creates a copy of the photo in JPEG format, which opens in the other application. To edit the photo in its original RAW format, drag the photo from the iPhoto window to the Finder, and then use the other application to open it. (If you previously used iPhoto to edit the RAW photo, select the photo and choose Photos > Revert to Original before dragging it to the Finder. This way, you can edit the photo using its RAW data in the other application.) If you want to import the photo back into iPhoto, you must first save it as a JPEG or TIFF file."
--Or, with iPhoto open, you can drag a picture from the library window
to your desktop (you see a + sign on the pic you are dragging). You now
have two of the same picture, one in the iPhoto library and one on your desktop. You can open up the one on your desktop in any graphic program and work on it. The one in iPhoto stays the same. You can also share/export the picture/pictures to your desktop or folder to work on them or do batch processing, etc. You will still have the originals in your iPhoto Library.
--Or, you can open up the ~/Pictures/iPhoto Library/folders and option drag any
picture out of the folder to your desktop. Notice that you will see a plus sign while dragging the photo. This is copying the file to your desktop
I would advise anyone not to do this as they might forget to use the option key and drag the photo out. Next time you open iPhoto the photo will be missing.
-The one option you will not find within iPhoto is to resize photos. iPhoto wants you to keep all full size images within iPhoto to give you the best size for printing or using for other applications. You can however go to Share>export (for iPhoto 5) or File>export (for iPhoto 6) and choose the naming scheme, input the dimensions and export to the desktop to use for uploading to a web space or emailing.
--to email a photo set up your email client in iPhoto Preferences. Once done, just select a photo/photos and hit the email icon in the toolbar.
If you use a web based email, then you need to export the photo to the desktop and upload it from there.
Two Apple kbs for you to read
Don't tamper with files in the iPhoto library folder
About the iPhoto Library folder
Don't forget that in Library view you can Control click on any picture and get a contextual menu with many options. One is to revert to original.
For more help and information you can go to the Help menu wiithin iPhoto and input your search term in the search bar, then hit the "enter" key on the keyboard.
You can also go to the iPhoto Support site.
iPhoto Support

I have an imac 27 inch O SX 10.6.8. using iphoto 11 Version 9.1.5. I have scanned some photos at very high resolution with each photo being about 45MB. They're saved to desktop. How can I reduce the size of the scanned photo's they are crashing iphoto

I have an imac 27 inch O SX 10.6.8. using iphoto 11 Version 9.1.5. I have scanned some photos at very high resolution with each photo being about 45MB. They're saved to desktop. How can I reduce the size of the scanned photo's they are crashing iphoto.

What format are they? Tiif? Jpeg? You can compress them with a lot of apps - including Preivew and just about any graphics editor out there. I'm not sure that 45mb would crash iPhoto thogh, are yo sure that's the cause? I know that some folks have mentioned pixel dimensions causing issues, as can color profiles.
Regards
TD

PE7: Problem with auto file naming of scanned photos

I began scanning photos using PE7. PE stored the files in my designated folder. It named the first scan "Image1.jpg." Thereafter, files were named "Image1-nn.jpg." I would finish for the day, and PE would pick up where in left off in file naming for the next batch.
All was well until I got the bright idea to rename the first photo to "Image1-0.jpg," so it would sort properly. Worse, perhaps, I renamed it outside of PE, in Windows Explorer. Unfortunately, this confused PE completely. Now, it wants to restart the file naming with "Image1.jpg," and scans terminate with a message that the scan was unsuccessful because there is already a file with that name in the catalog.
How do I go about resetting things back, so that subsequent scans resume at the next available file name+number?
Second, is there a way to control what prefix ("Image1") gets inserted in scanned file names?
Thanks.

By renaming the file outside of PSE, it's now "missing" in your PSE catalog and PSE doesn't know how to find it -- its thumbnail should have a yellow question mark on it. Do File > Reconnect > All Missing to reconnect any missing files with their new locations, and going forward, only rename and move files in the catalog using PSE.
Once you've reconnected the missing files, the scanning should no longer be confused about file names.
I don't think you can control the filenames used by the scanning. You can set the folder used via Edit > Preferences > Scanning. For a number of reasons, I do scanning in two steps -- first, I use the scanner's utility to scan to a file, then I drag the file into the Organizer. This gives me fine control over the file's name and folder location.

How do I get my HP 7525 scanned photos to show up in my Windows Photo Gallery?

When I scan photos on my HP 7525, they show up in Documents on my Dell PC. I want them in my Windows Photo Gallery. How can I make make this happen? My PC is connected to the printer with a USB cable.
Thanks for any help you can offer.

I don't have a windows photo gallery on my PC (I'm running Windows 7).
I pulled the following from the Microsoft help page:
When I import pictures and videos from my camera, how do I change where they are saved and what they are named?
By default, all pictures and videos are saved to the Pictures folder in a folder named for the current date and the tag you assign to the pictures when they’re imported. Each picture is given a name that includes the tag. To change the way your pictures and videos are saved to your computer, do the following:
Open Windows Photo Gallery by clicking the Start button , clicking All Programs, and then clicking Windows Photo Gallery.
Click the File menu, and then click Options.
Click the Import tab, and then do one of the following:
Click Browse to change the folder that pictures and videos are copied to.
Click the Folder Name list to name the folder using other elements, such as the range of dates in which the pictures were taken. You can add several items together to create a more descriptive folder name.
Click the File Name list to change the information that is used to create the picture's file name.
When you are finished making changes, click OK.
"Although I work for HP, I'm speaking for myself and not on behalf of HP"
"Say "Thanks" by clicking the Kudos Star in the post that helped you.
--Please mark the post that solves your problem as "Accepted Solution"

Can't Move Scanned Photos

When I scan photos into a file in the iPhoto library, the photos stay in the upper left hand corner of the page and I can't move them. I'm brand new to this program and I'd appreciate any help you can give. Thanks.

Hi kodiakid,
I am not understanding what you mean by "When I scan photos into a file in the iPhoto library, the photos stay in the upper left hand corner of the page and I can't move them."
What do you mean by the upper left hand corner of the page? Can you describe what you mean a little more.
I can tell you that you can't scan into iPhoto. You have to scan the image and save it as a file on your desktop (easiest place to save it) or you can create a folder called scans in your Pictures folder.
Next read more info that will help you.
--First thing to know and remember is this...Do not drag any images, folder of images into the iPhoto Library in the Finder. Images have to be imported into iPhoto within the application. Do not scan images and save them into the iPhoto Library folder in the Finder. Save them to another location such as the Pictures folder or even the desktop. You can then import them into iPhoto.
If you have already put files/folders in the iPhoto Library folder in the Finder then you will also find out that if you try to import them into iPhoto you will get an error message. No worry, just drag them to the desktop and import from there.
--All images that you import are shown in the library view. You can choose how you want to view, by rolls, by date, by rating, etc. When you put images in an Album, slideshow, book, etc, you are actually just putting pointers to those images in the library. You are not adding more images. If you delete an image from the Album it will still be in the library. If you delete an image from the library it is deleted from iPhoto's database and your hard drive (unless you have it backed up somewhere else)
--You have a folder of images on your hard drive and want to import them into iPhoto. Drag the folder of images into an open iPhoto Library window and the folder of photos will be copied into the library, resulting in a new roll with the name of the folder. You now have two copies of those photos, the ones in iPhoto's database and the ones on your desktop. You can keep the ones on your desktop that you just imported as backup or you can delete that folder.
-- you scan a picture/pictures and save it in a folder. You cannot scan directly into iPhoto or the iPhoto Library folder in the Finder.
You want all your photos in iPhoto so you import them into iPhoto.
Now you have two copies of that picture/pictures, so you can delete the originals that were in the scanned folder and keep the one/ones that were imported into iPhoto.
-- You download pictures from your camera into iPhoto.
There is now one copy of each of the pictures. (DO NOT HAVE IPHOTO DELETE THE IMAGES FROM YOUR CAMERA! DELETE THEM MANUALLY WITH THE CAMERA-if something goes wrong with the import and they are never imported and then they are deleted from the camera you might end up losing those images)
You want to change something about a picture you imported, such as
cropping it or changing the size, or changing the orientation.
Once you do that to a picture, you now have two copies of the picture
in iPhoto, the original and the edited one. The edited one will be in the library organize view. The original is packed away in an Original folder in your iPhoto Library folder under the date of the roll. You can always revert to the original by control clicking on the photo and choose "revert to orginal" You will not have this choice if you used iPhoto Diet to get rid of the Originals.
(a quick note on cropping within iPhoto...when you are in edit mode, you automatically will be in the crop mode with cross hairs to highlight the crop area. To finish cropping you must click the crop button and then go back to library view and your cropped picture will be there.
3.You want to use Photoshop or another graphic program to edit a picture in your iPhoto library.
You can open up prefs for iPhoto and choose "when double clicking on
photo ..do" choose "other" and select Photoshop. Now you can edit all
pictures in your iPhoto library in PhotoShop by double clicking. If you save the photo with the same name and as a flattened file it will be saved right into iPhoto and you will see the changes. If you don't want to save it into iPhoto then do a "save as" and save to the desktop. You will then have the original photo still in iPhoto and your new edited photo on the desktop.
Or, with iPhoto open, you can drag a picture from the library window
to your desktop (you see a + sign on the pic you are dragging). You now
have two of the same picture, one in the iPhoto library and one on your desktop. You can open up the one on your desktop in any graphic program and work on it. The one in iPhoto stays the same. You can also share/export the picture/pictures to your desktop or folder to work on them or do batch processing, etc. You will still have the originals in your iPhoto Library.
Or, you can open up the ~/Pictures/iPhoto Library/folders and option drag any
picture out of the folder to your desktop. Notice that you will see a plus sign while dragging the photo. This is copying the file to your desktop
I would advise anyone not to do this as they might forget to use the option key and drag the photo out. Next time you open iPhoto the photo will be missing.
Two Apple kbs for you to read
Don't tamper with files in the iPhoto library folder
About the iPhoto Library folder
Don't forget that in Library view you can Control click on any picture and get a contextual menu with many options. One is to revert to original.

What dpi to scan photos?

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