Image size/resolution question

I’m starting to get to know Keynote (3.0.2) for the first time.
My Document Slide Size is set to 1024x768. I’m building slides by dragging and dropping up to four jpegs on to one slide.
Q1: Is a resolution of 72dpi sufficient for these images? I’m utilizing original images at anything from 72dpi to 300dpi – if I downsize them all to 72dpi before dropping them in is that OK?
Q2: Is it OK, when an image is to be used on a slide at 500px375px for the original image to be that size? Or is advisable to use Keynote to resize down from a larger image?
I’m just looking for the best quality on the screen.
Lots of good advice on this forum.
Thank you, in advance, for any help.

Basically, don't worry about dpi (dots per inch), only worry about dots. That is, your 500x375 pixel image has a certain number of dots per side, but its dpi could be almost anything, but the dpi is irrelevant for Keynote. (A 500x375 image at 300dpi is exactly the same file size as 500x375 at 72dpi - the total number of pixels in the image is exactly the same, all that's changed is how it translates into inch dimensions - the 300dpi one will be ~4x smaller in inch dimensions). All that matters is the outer dimension and how that compares to the nominal dimension setting of your presentation.
Larger images take up more memory and make the file bigger. Having files significantly larger than the size you plan to project at (usually 1024x768) doesn't help much in terms of visuals. Keynote does a good job of scaling images up and down if the display device output is different than the nominal size of the presentation. Keynote is much faster at dealing with large images that PPT is on a Mac, so the penalty is not there if you use large images.
As a general rule, unless I'm really trying to minimize file size or the image is gigantic in kb, I don't bother with resizing ahead of time, it's just not worth the hassle to me. I try not to drop in multiple mb jpegs, for example, but anything around an mb or less is not worth downrezzing. My company regularly produces 30-50mb decks, so we're just used to it.
Uprezzing small files significantly should be avoided, as it obviously leads to pixelation and artefacts that are distracting. Having said that, Keynote does as good a job as you can expect in this area.
Unless I'm missing something (I'm not a Keynote power user), Keynote lacks the file compression tools of Powerpoint (esp on PC, which allows images to be down-rezzed and cropped portions of images to be discarded, which has dramatic effect on reducing file size). So if you need to keep Keynote file size small, you need to do the legwork to reduce the image file (as opposed to just dpi) sizes before importing them.
HTH
Adam

Similar Messages

How to make Image/size/resolution agree with metadata resolution?

After scanning the help file a bit and searching thru this forum a bit with `metadata resolution' as search criteria, I'm still pretty confused about how it is supposed to work.. I may have never actually found the right part of the help file.
Cutting to the chase: How can I make the resolution reported by the metadata tab for resolution agree with what is reported inside photoshop at Image/size resolution. I didn't see any way to set how res is reported in bridge.
I see many pictures reported in metadata as 72 ppi for resolution and reported in photoshop as 200 pixel/inch
They do BOTH mean pixels per inch right? If so, or really even if they don't how can I get the two reports to show the same resolution?
There are too many processes that depend on knowing res in advance of opening a file for that to be so far divergent.

Jingshu Li wrote:
Some JPG or Tiff with Camera raw settings will be opened in ACR firstly when you double click them. In ACR workflow option (the bottom in the ACR dialog) the resolution value isn’t same with that in Bridge (metadata panel). If you go ahead to open the image in PS by clicking ‘Open Image’ button in ACR dialog and then check the image size from Image -> Image Size in PS, the resolution will be same with ACR (actually it is changed by ACR).
If disable ACR support for JPG and Tiff in Bridge (Open Camera Raw Preferences in Bridge and choose ‘Disable JPEG support’ or ‘Disable TIFF support’ for ‘JPEG and TIFF Handling’), JPG or TIFF files will be opened by PS directly and the resolution matches between Bridge and PS. I believe this is an ACR bug.
So what file types are you using and if they’re opened by ACR firstly in your workflow?
The files are *.jpg. But I don't see where camera raw comes in. These are common jpg files. I'm opening them by double click in bridge.
Any way I did disable jpg and tiff in the Camera Raw preferences as you suggested. At Jpeg and tiff handling, both disabled. and restared bridge.
However, I see no improvment.
For example, a file reporting 72 ppi in bridge when opened in photoshop ... Images/size resolution reports 480 pixels/inch.
There is obviously some kind of miss handling that has been done to these files for them to have such a high resolution. I suspect they may have been handled at Walgreens or Walmart... or similar since I had something very similar happen to me once when I had a bunch of pictures developed at Walgreens and they cam back with resolutions like that, when I know the camera would have given them something way less.
But I don't see how any of that should be effecting Bridges inability to get the resolution right.
Here is another example: some.jpg
It appears that bridge is showing an unusually huge file size in inches, to account for the reported 72 ppi.
Bridge:
Size: ...............1.14mb
Dimensions:.....1496x1064
Dimensions in
inches ............20.8x26.7
Resolution: .....72 ppi
===========================
Photoshop:
pixels
Width 1496
height 2064
Document size
inches
width 4.987
height 6.88
Resolution 300
Do you have further suggestions?

Photoshop CC crop image size & resolution dialog box

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In photoshop cc 2014, the size and resolution boxes will actually show on the tool options bar instead of a separate dialog window, by choosing W x H x Resolution from the drop-down menu.
http://helpx.adobe.com/photoshop/using/crop-straighten-photos.html

Relation between image size, resolution and pixels

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In my understanding if image blow up the number of pixels will be same as original and only the distance between pixels will be increase. So, resolution should
be dropped.
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More realistic looks sample B.
Now other way: I used crop - make original image smaller. So, the number of pixels should degrees and resolution NO CHANGED. But PSE 9 shown number of pixels same and resolution increased.
Is it right?
What is wrong or right in above explanation?
Can visible find the difference between samples A & B on computers monitor? I tried blow up sample B by 10 times and still no differences on screen,It is because resolution of monitor to low?

A. Resample means elements adds pixels to the existng pixels to increase image size
    and\or resolution and subtracts pixels to downsize. Usually resampling to make an image
    smaller is okay, but resampling to make an image bigger can result in loss of quality.
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B. Leaving the resample box unchecked, elements only changes resolution (print size)
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Usually a resampled image will be of lower quality than a non resampled image because
elements has to make pixels to upsize and subtract pixels to downsize.
Elements uses the resampling method choosen in the image size dialog to determine how,
with one of the bicubic choices being the best for photos.
Elements, as far as i know, uses the standard bicubic mehod for the resampling with the crop tool.
A more detailed explanation:
http://kb2.adobe.com/cps/331/331327.html
MTSTUNER

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Why is that when I change the resolution under image/image size the width and height change?

Thank you so much, resample image was unchecked. I've never had that problem before, so I thought I might have clicked on something.

Image Size/Resolution for ProShow Producer ?

Need to prepare images for a slideshow I am creating in ProShow Producer. Not understanding their suggestion to convert my images to jpeg 1.5.
The projector is 1920 X 1080 and will be shown on a 26' wide screen at a movie theater.
I correct the RAW image and then Save As tif (dimensions are 5184 X 3456 at 300 ppi).
Usually I resize the tif at this point and Save As jpg. When I resize I have always put in the dimensions 1920 width for landscape images and resolution 300 ppi.
Would you just change the pixel Dimensions and leave the Document size alone?
They want me to Save As jpeg 1.5 and I don't understand what they are asking me to do or how to do it.
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try google. It appears to be a webcam format.

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As I understand it, 4:2:2 is the best res to work with when compositing. If I pull a image sequence say from something other than 4:2:2, say DV, does the image sequence still maintain the res? Or since I am dealing with an image, .tiff, the res does not make a difference as long as the image is not compressed. Any insight would be helpful.
Thanks,
Ed

Wolf359,
"4:2:2" denotes the luma/chroma channel compression.
Compression (image sampling quality) is independent of resolution (picture size). Those two variables together determine file size.
Check out these two sites for in-depth info on compression & video formats:
http://www.adamwilt.com/DV-FAQ-tech.html#colorSampling
http://en.wikipedia.org/wiki/Chroma_subsampling

Photoshop, large graphic, stock image, size, resolution

Hi.
I am going to make a large graphic about 10 feet x 9 feet using 150 resolution. I have this image in 300ppi that is roughly 12x8 inches. Can this image cover the background of the large graphic without looking too fuzzy?
Thank you.

depends on how back you stand. .. :)...400m might be OK
To resize to 9x10ft from a 12x8ins image will yield poor results.
But try it and see for yourself. You can get fractal software that'll help, a bit....or you can import it to a vector program and convert it to a vector then you can scale as much as you like...but you will still lose quality during the conversion.

Decreasing image size/resolution but then goes back to old size when click ok

Hi,
Hope you're well.
I am working with a photo that I would like to post to a website and want the final size to be 640 x 360 px. The current size is 1024 x 828.
Is there a way to decrease it to 640 x 360 without cropping it?
Thanks!

Changing aspect ratio without visually distorting the subjects unacceptably can often be accomplished through the use of the Content Aware Scaling feature.
-Noel

How set image size open raw file?

How to set image size/resolution when opening a raw file in pse 11 editor??
win 7 pro; pse 11 settings: edit>preferences>print resolution = 337.596, screen resolution 109 dpi( 27 inch, dell U 2711). Originally print resoltuion was set to 240 dpi but was changed in case this was causeing a problem. CRAW v 7.4.0.137
Camera alpha 65, image size is: 6000x3376 dpi; (83.33x46.88 inch)
Problem is: Currently when I edit a RAW file in CRAW and then open in pse editor image size is: 6000x3376 px; 25x14.667 inches at 240 dpi ( by ration this corresponds to:17.773x10 inch at 337.6 dpi)
I am trying to change settings so the raw file opens as: 17.776x10 and anywhere from240 to 337.6 dpi
whatever works or is esiest to set.
My settings are for use in creating blue ray dvd movies and with cropping and editing printing high quality pictures for family.
Thanks in advance for any help you can provide.

That's a Sony Alpha SLT-A65?
Are those pixel dimensions of 6000 x 3376 the size the camera raw files came out of the camera?
You can't really change the resolution that the photoshop elements version of camera raw opens the the files into the pse 11 at.
(i think 240 is the default for most cameras)
You can however set the resolution with Image>Resize>Image Size if you need to for printing or other uses.
In the Image size dialog uncheck Resample Image and enter the resolution.

Image size and resolution question.

Is an image at W 48.667 x H 32.444 inches at 72 res the same as an image that I could convert in photoshop to 300 res and then the with "Resample Image" clicked off would be W 11.68 x H 7.78 at 300 res for printing purposes? I'm asking this questions because after exporting 200 images from Lightroom 1.4, putting them into an wedding album I realized the images were not at 300 res but the first size listed above. I'm trying not to have to rebatch and have to put them back into the album. I sent the question to NAPP and got this back"
"If you do the math you'll see that the answer is "no."
48x72=3456 pixels; 32x72=2304 pixels
11.68x300=3504 pixels; 7.78x300=2334 pixels."
I did the math and it comes up to 5760 vs 5830. Pretty darn close. So would an image printed out with both settings print the about the same quality or am I missing something?
Thanks
Bob

Bob's question is a common one. And one of the first that most of us struggled to understand. Let's see if I can shed some light to help clarify the matter.
o The image starts out with a given number of pixels from the camera, scanner, or whatever was its source. The resolution only matters when it comes time to print the image.
72 dpi was once a common resolution for displaying on a computer monitor. Today 90 dpi is more common monitor resolution.
o Let's assume that the image is 3504 x 2336 pixels (which I got from his size @ 72 dpi).
o In "image size", if you do _not_ have 'resample image' checked, all you are doing is _rescaling the image. The image resolution is whatever you enter ...
For example, if you enter 360 dpi -- the native printing resolution of many Epson printers -- you get a print size of 9.733 x 6.489 inches
o Let's say you want to print this image at 360 dpi in portrait on 13 x 19 inch paper with a one inch border on the sides. That would make the short dimension of the image 11 inches and the long would work out to 16.5.
To do that you need to _resample_ the image to change the size. More pixels will be made. The resolution stays at 360 dpi. So check the 'resample image' box.
After resampling to get the print size and resolution you want, the pixel dimension goes to 5960 x 3960 (from 3504 x 2336). Those new pixels came at a price, but that is a matter for another thread and a lot of personal bias.
Hope that helped.
P.S. The answer to your question, Bob, is yes. With resample off in PhotoShop, your original images should have gone to 11.68 x 7.787 inches @300 dpi.
In looking at the rest of your original post, it seems that the export didn't work the way that you wanted. Do I read right that the images turned out to be 11.68 x 7.787 @ 72 dpi? Can't help with that as I don't do Lightroom.

Image size related to screen resolution - Questions

Trying hard to get my head around picture dimensions vs quality vs screen/printer resolution, can anyone confirm if what I think I understand is correct.
My Canon RAW images are 3888 x 2592 pixels. If I export from LR a full sized JPEG (at 100% quality) I get an image that is 3888 x 2592 pixels in size. So the questions:
1) If I open the JPEG in something simple like Windows Picture Viewer and hit the 'Actual Size' button then put simply is each pixel in the picture lighting up a pixel on the screen ?
2) If I zoom out then presumably there are more picture pixels than screen pixels so some data is thrown away and there is some downsizing of the image ?
3) If I zoom in then there is not enough data and there is some intrpolation to upsize the image ?
What I'm actually trying to get to grips with is, if i want to post pics online or e-mail them, when to drop the quality a bit to save filespace and when to change image size.
Cheers

Downsample a LOT for email and quite a lot for web viewing. Not only might they not look as good as they should, people will not be happy waiting for a 3000+ pixel image to download to them.
A "full width"
Of course, if someone wants to print the photo, then you need to maintain the resolution and they should know it will take some time to download.
If you want to see what size others use for the web and can't estimate by looking at it on your monitor in a browser, you can find out the dimensions of a picture you are viewing. In Firefox and windows, right click on the photo and select properties.
flickr, for example, resizes to various sizes. Even though you can upload full size images to flickr, you might not want to do so to protect your full-size image from being used.

Image size and resolution....just when I thought I understood!

I couldn't find this question anywhere else, but I can't be the only one who's come across this:
I have an image in a folder...finder/explorer tells me that it's 638px X 479px, and 234KB.
I open it in Photoshop and go to Image Size. PS says it is indeed 638x479pixels, but that it's 5.4" x 4.06" at 300pp and the "pixel dimensions" add up to 895KB?
(Then, when I place it in InDesign, at 100%, it measures around 2.1" x 1.6"? What's going on? If I input those dimensions into the Image Size dialogue box in PS, without resampling, it would have to be 750.25ppi. Obviously it's not.)
How big is this file really? Which program do I trust...windows explorer or photoshop?

The ppi resolution is simply a number stored with the file to indicate how large to display the image. The height and width in pixels are part of the image data itself. So the pixel dimensions are always the number to trust.
You can open an image in Photoshop and in Image Size change the resolution (ppi) and if you don't check Resample Image the actual image data don't change at all, only the number stating the pixels per inch.
The reason the Pixel Dimensions size in KB is different in Photoshop vs. Explorer is that the file is likely a Jpeg, which is compressed. When Photoshop calculates pixel dimensions, it does this based on an uncompressed file (each pixel=3 bytes for an 8-bit RGB image.) When Jpeg compression is used, a pixel can be much less than 3 bytes, and the actual number varies depending on the image quality and how detailed the image is.
To see this, save your image as an uncompressed Tiff format and the size will very closely match the pixel dimensions. But if saved as a Jpeg, it will be smaller but still the same height and width and the same ppi.
If you are using CS3, it automatically uses a form of lossless compression if saving in PSD format with "Maximize Compatibility" disabled. So in this case the file size will also be smaller than the pixel dimensions number, but if saved in Tiff, it will match that number instead.

Scanning: The image size is too big. Please reduce the image height, width, resolution, scaling or output type.

Good Day.
I have recently discovered an issue with scanning. I have tried scanning straight from the printer, through image capture, and through preview. All yeilding the same results since they are essentailly kicking off the same scanning applet. I can scan a jpeg formatted file as long as I applet is in the "Hide Details" mode. If I click on the "Show Details" button, which I need to do to scan to PDF, I immediately receive an error stating: The image size is too big. Please reduce the image height, width, resolution, scaling or output type.
I'm currently using an HP C5180 printer.   The most recently installed software was Adobe Digital Editions (I installed this to read an on-line e-book). Not sure if there is any correlation.    Thanks for any help.
Mac details are:
Model Name:          MacBook Pro
Model Identifier:          MacBookPro8,1
Processor Name:          Intel Core i5
Processor Speed:          2.3 GHz
Number of Processors:          1
Total Number of Cores:          2
L2 Cache (per Core):          256 KB
L3 Cache:          3 MB
Memory:          8 GB
Boot ROM Version:          MBP81.0047.B27
Printer access log:
Source:          /var/log/cups/access_log
Size:          174 bytes
Last Modified:          11/21/12 10:09 PM
Recent Contents:          localhost - - [21/Nov/2012:22:09:16 -0500] "POST / HTTP/1.1" 200 61628 CUPS-Get-PPDs -
localhost - - [21/Nov/2012:22:09:20 -0500] "POST / HTTP/1.1" 200 61628 CUPS-Get-PPDs -
Image Capture Support:
Image Capture Support:
Path:          /Library/Image Capture/Support/Hewlett-Packard/Devices/HPAiOScan.bundle/Contents/Info.plist
Version:          2.3.0
Path:          /Library/Image Capture/Support/Hewlett-Packard/Devices/HPAiOScan.bundle/Contents/Resources/Dev iceInfo.plist
Version:          2.3.0
Photosmart C5100 series:
Status:          Idle
Print Server:          Local
Driver Version:          4.0.0
Default:          Yes
Shared:          No
URI:          dnssd://Photosmart%20C5100%20series%20%5B960B9E%5D._pdl-datastream._tcp.lo cal./?bidi
PPD:          HP Photosmart C5100 series
PPD File Version:          4.0.0
PostScript Version:          (3011.104) 0
CUPS Version:          1.6svn (cups-327)
Scanning support:          Yes
Scanning app (bundleID path):          -
Scanning app version:          -
Scanner UUID:          CC8DD435-CC8D-D435-CC8D-D435CC8DD435
Printer Commands:          ReportLevels
CUPS filters:
Inkjet:
Path:          /Library/Printers/hp/cups/Inkjet.driver/Contents/MacOS/Inkjet
Permissions:          rwxr-xr-x
Version:          4.0.0
commandtohp:
Path:          /Library/Printers/hp/cups/filters/commandtohp.filter/Contents/MacOS/comman dtohp
Permissions:          rwxr-xr-x
Version:          2.1.1
Fax support:          No
Printer utility:          /Library/Printers/hp/Utilities/HP Utility.app
Printer utility version:          5.9.1
PDEs:
PDE.plugin:
Sandbox compliant:          Yes

Hello Sig
The scanner works with a Windows computer, which proves the device is functional at a cursory level. The drivers are now distributed by Apple and this is an Apple computer. There is no scanning software provided by HP. HP's answer is that Mountain Lion takes care of all of this. I anticipate that some setting or driver was somehow tweaked since the scanner had been working with Mountain Lion until a few days ago. The device in question is an Apple product. So, I'm pretty confident that I'm in the right place.
Regards

Hello, we are interested in more information on the Image Size Fit To option in phototshop. For example, if we open a 46x25 inch 120 dpi image and choose Fit to 4x6" does all of the resolution remain? Any links to tutorials in this area are appreciate

Hello, we are interested in more information on the Image Size > Fit To option in phototshop. For example, if we open a 46x25 inch 120 dpi image and choose Fit to 4x6" does all of the resolution remain? Any links to tutorials in this area are appreciated.

Let's look at the first thing: Aspect Ratio 46W x 25H does not fit 6W x 4H exactly. You get 6W x 3.621H If we preserve Landscape Orientation and Aspect Ratio. If I set H to 4, W will be 7.36 inches, clipping your picture.
You'll have to decide on how to clip off that 1.36 inches so your picture can be 4 x 6 in order to solve that problem.
Notice I set Resample off. Throwing out pixels is destructive editing. So what I am doing is "Scaling", changing the Print Size without touch the pixels. Notice how high the resolution goes up.
To Resample or not will be your decision. I hope I answered your questions properly. Let me know otherwise.
Gene

Image size/resolution question

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