Photoshop and file sizes

I saved a file for web and devices and it says its 40kb. ok fine but then I open it in photoshop and go to image size and it claims its 300kb??
which is the real size???

If you were looking at the JPG on your hard drive then that is highly compressed. When it opens iin Photoshop you are looking at the raw data (as opposed to a Camera RAW file) which will typically be in the order of ten times the size of the JPG (according to quality settings when saved).
Wikipedia has a great article on JPG with some great graphics. I stole the Mile Stone graphics for a camera club presentation a few years back.

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Shedding light on export settings and file size

I am trying to learn about exporting images and file size. I have a combination of RAW and JPEG images in my library. For the sake of this discussion, I am going to limit this to JPEG's. I need to export my images, so that I can then upload them to an external photo processing site like Kodak.com. I was going to export versions of my images because I have made adjustments to many of them. I was going to choose the top level preset of "JPEG - original size." For the sake of example, the file that I try exporting this way has a file size (in Aperture) of 1.94 MB. After exporting it (with a DPI of 72) and a color profile of sRGB IEC61966-2.1 (I am not sure what the significance of the DPI and color profiles are either), I get an exported image with a file size of 4.6 MB. When I export the master image, I get a file size of 2.0 MB. I'm completely confused and at a loss as to what is going on here.
Can someone please shed some light on how to go about exporting images so that I can be certain that I am exporting the best quality image possible.
Also, and possibly more importantly, I export image files to sites like MobileMe Galler, Flikr and Phanfare, etc, for the purpose of archiving my images and now I am not sure if the files I am exporting are of the optimal most quality they can be. Do these settings have any bearing on the images that are being sent to my archival folders?
Thanks in advance for any input on this important topic.
Mac

This confusion is because of the way Jpg files handle data. Jpg is a kind of file that compresses data to achieve a balance between image quality and file size. The jpg file that your camera saves to disk is also compressed, that's why the difference in size between a 2 MB jpg and the same image in Raw is for example 18 MB.
Jpg is a lossy compression format, every time you save a jpg some compression is applied, say after editing in Photoshop. Aperture must be reading your jpg masters to export jpg files to disk, so the difference in size should be the compression quantity applied to the newly created jpg file. I could have a 1 MB jpg file previously compressed with a quality level of 7, but if I export it at a compression quality of 10, the file could easily become a 2 MB file. The problem is quality doesn't increase with file size when the original file is a jpg.
Also some files include a preview image inside the file, increasing the final file size. The color profile embedded should't increase size by much, since most camera jpg files already include a color profile embedded (color profiles tells computers to display color consistently between applications and peripherals like printers. sRGB is widely used for images published on Internet).
As for the images you are sending to the archival folder, I would suggest you to export the masters, instead of exporting a new jpg file from an already compressed jpg master.
I know this is a complex subject so I hope I haven't confused you.

InDesign Transparency Effects - Problems with Image Quality and File Size

Hello,
We are experiencing new problems exporting InDesign files to PDF.
To summarize, though our largest workflow is to create files for offset printing, we also deliver our work to PDF for mounting on a website so our clients can download directly from the web. Our new problem is Transparency Effects, and creating a PDF that will both have a high quality (or resolution), and be a small file size.
We are working with multiple page documents (24 to 48 pages), and would very much like to work with InDesign Transparency Effects. However, after spending much time testing a variety of PDF types, we are finding there is a radical difference between quality and file size. I was curious if anyone has had these problems, and if there is a simple answer. InDesign is an incredible program that allows us to design on the fly with Transparency Effects, but, if we are going to experience these problems, we will have to eliminate these wonderful tools.
Can you help me or lead me to information online that will help.
Thank you,
Lain

Please don't post in multiple forums. Your question has nothing to do with the PDF language and specifications, but rather PDF workflow or InDesign. I've responded to your other posting and am closing this thread.
- Dov

I print 2 pages to pdf and file size is 600k, I print 1 additonal page and file size goes to 6M, what would cause this (graphics are same on all pages)

I print 2 pages to pdf and file size is 600k, I print 1 additonal page and file size goes to 6M, what would cause this (graphics are same on all pages).
I know the colour graphic shading in the document that causes the issue of larger file size, but it doesn't make sense that printing 1 additional page with same information as first 2 pages would cause this.

I print 2 pages to pdf and file size is 600k, I print 1 additonal page and file size goes to 6M, what would cause this (graphics are same on all pages).
I know the colour graphic shading in the document that causes the issue of larger file size, but it doesn't make sense that printing 1 additional page with same information as first 2 pages would cause this.

PNG-8 vs PNG-24 and file size

I am creating a series of PNG files to display a progress bar when a user taps an audio file. When I saved them in PNG-24 format, the transparency works fine, but these files are about 350k each. I have 12 files showing the progress bar = 4.2 MB.
If I save them as PNG-8 out of Photoshop, the file size for each PNG drops to 1k, my progress bars then = 12k as opposed to 4.2MB
Problem is that I can't see the transparency. Does inDesign or DPS support PNG-8? Any ideas on how best to reduce filesize?

PNG-8 is supported. But not all of its features. You could save a super efficient reduced PNG-8 with alpha-transparency in Fireworks. But it would not work as expected when placed in InDesign.
The InDesign import filter should be updated… (InDesign CS6 perhaps?)
Uwe

Pixel Dimensions and File Size

Can anybody please explain the relation between pixel dimensions and file size?
Being naive, (or straight-forward if you prefer) I had assumed that pixel dimensions wide times pix dimension high = file size. Wrong!
For instance a .JPG file 374 X 500 has a file size of 41,275 bytes. But 374 times 500 = 18,700 so the two are different issues.

Thanks Rich. It kind of sounds like you know something about this.
I see 1 pixel, and 24 bit color would make 24 bits at 8 bits to a byte, so there's the 3 bytes.
I selected a certain photo and used the APPLE i command to see if could find if it had 8 bit color or, whatever. That infomation was not on the info function, but it did say something about RGB color profile.
Is 8 bit color a near certain bet in most applications, or was that just for the sake of illustration?
I Googled 8 bit color and go to a Wikipedia Article
http://en.wikipedia.org/wiki/Color_depth
which explained a lot, but its more technical depth than what I'm prepared to deal with. The net net, as far as I can tell is that image size (before compression) is dimension times color depth in its native mode, but I suppose what the native mode is and what the displayed mode is could be separate issues?
I was under the impression that the compression in JPG formt files comes out, or is decompressed, when the photo is printed or displayed? No?

Lightroom, Photoshop, Image and File Size | Adobe Evangelists - Julieanne Kost | Adobe TV

In this episode of The Complete Picture, Julieanne explains how LIghtroom determines the file size and resolution of a file when using the Edit in Photoshop command.
http://adobe.ly/YasSCQ

Have you tried, emptying your cache in your browser? Also, try a different browser ie chrome, safari, firefox. If your problem persists please send me an email with a detailed systme configuration spec to [email protected] and we can investigate offlist further.
Thanks!
Mike Burton
Adobe TV Administrator

Photoshop PDF and File Size...And Into Acrobat

I have an 8x10 at 144 ppi
I Save As Ps PDF> Compression> Options> DO NOT DOWNSAMPLE
Compression: JPEG> Image Quality: MAX (gives me 6mb file)
Compression: JPEG> Image Quality: MEDIUM (gives me 9mb file)
Ps> Save As JPEG gives me 840kb file
HOW can I get Ps to Save a PDF in the JPEG file size?
I want to set the resolution and quality in Ps and SIMPLY move it to a PDF...

Bingo, unchecking Preserve PS editing fixed the problem...thanks

Digital Image and File Size

Other than using an Image editing App such as iPhoto or Photoshop Elements, is there a way to figure out or calculate the file size (in MB) of an image containing xx number of pixels? Thanks, Bob

Robert:
To add to Barbara's post, you can set the pixel dimensions and dpi to what you need in PS/PSE and then do a Save As where you'll get a slider to set the quality level and it will tell you what file size that will result in.
However, as Terence pointed out, some trial and error in exporting out of iPhoto and setting the dimensions to what you want and selecting a different quality level will quickly tell you what you need to achieve those specs.
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've created an Automator workflow application (requires Tiger), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 08 libraries and Leopard. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.

Specify exact pixel and file size

Hello,
I have recently purchased Photoshop Elements 4.0 for Windows for a company project. I need to compile a number of outdoor photographs to be uploaded to a specific website. The photo specifications required by the website are that all photos must in JPG format, be 350 pixels across and no more than 40kbs in file size. I've been experimenting with photoshop to try and achieve this effect, but am wondering if there is a simple way to accomplish this. I have been able to adjust horizontal pixel number, which automatically adjusts vertical pixel number and photo size. When I save photos, I am able to adjust what I assume is the resolution of the photo. If there is not too much color contrast in the photo, I can sometimes reduce the file size to 40kbs by taking it as low as it will go, but not always. I was just wondering if there is a simple way to make sure that a photo will be saved with a specific pixel number and no more than a certain file size (40kbs). I would greatly appreciate any suggestions.
Brandon

You can also set the pixel dimensions in S4W and save a step. Just enter the size you want in the box about halfway down the right panel, and then click Apply. Then you can optimize the file size by clicking the right-facing arrow at the upper right of the panel and choosing Optimize to file size. You can specify the exact size you want. Just watch the preview to be sure the quality is good enough at the target size.

Export Options_Automatic Stacking and File Size control

There is a big hang-up in work flow, and I'd assume it's the same for many professional photographers.
It would be great to be able to Export an edited photo (tiff, psd, jpg, RAW), and during the export be able to specify maximum file size (as you can control in Photoshop's Save to Web command), and then also be able to have Lighroom automatically stack the exported image with the original.
This is a big hang-up when you're finished editing multiple sized copies due to different media, and then you have the final web-sized image for your photo gallery. CUrrently, I have to go to Save to Web in Photoshop, and then save it to my desktop. Then I have to manually import that compressed jpg into Lightroom, and put it into the original library or collection.

Yes, the ability to export to a given file size would be awesome for those of us who post many images to the web.
Also, being able to export and automatically add the exported file to my catalogue (Same as when you edit in PS) stacked with the original, would really aid my workflow.

CS5 - Photo Saving and File Size

Recently I've noticed, when uploading some photo's to my web site that the file size is rather small. I know that cropping, processing, and saving to jpeg results in file size reduction.
So ... I did a test. I took one photo shot in the raw format (the file size was about 21 mp). I then took it into Photoshop CS5 and just saved it as a jpeg ... and the file size went to 9.9 mp. I found that to be a questionable reduction.
My image size details of the test photo is:
Pixel Dimenstions:
5616 px x 3744 px
Document Size:
18.72 x 12.48 and 300 px Resolution
All of the following are checked:
Scale Style
Constrain Proportions
Resize Image
I have selected:
Bicubic (best for smooth gradients)
I saved the photo at the highest quality setting of 12
So the Question: Is this test reduction normal or am I doing something wrong with my "save as" settings

There is no set percentage of compression, it depends on the image content. If there are layers jpeg will not save so that in itself will reduce size. Some web options even strip out metadata. So are you thinking that is too much or too little compression?
I do know that there can be significant differences in saving at image quality 9 or 10 and at 12. Try it and see what you get. For what is the correct compression it depends on the end use. For web use maybe all you need is 5.

Photoshop Save /File size estimate

Hi
I have a very silly issue that I am sure Ive either unset or has a simple solution. I am using Windows 64 bit photoshop cs5
When I go to file save as and specify JPEG as the file format. The file size estimate does not show anything. I can leave it for ages and it will not display the file size estimate.
Is this a setting that needs to be re-enabled? If so, could a kind soul point me the right direction please
many thanks, all the best
Neil

Zeno has explained it and provided a workaround, but the simple fact that the dialog does not provide an estimate where it should be is really a bug. I reported it a long time ago.
-Noel

Confused with saving and file sizes

HI THERE. IM JUST A LITTLE CONFUSED ON HOW TO SEND MY FILES. I WANT A POSTER PRINTED THAT IS 196cm height // 143cm width. WHICH IS THE SIZE OF THE DOCUMENT I MADE ON PHOTOSHOP. HOWEVER IM CONFUSED ON SAVING THIS FILE AS ITS TOO LARGE APPARANTLY AND CANNOT BE SENT BY EMAIL. IVE FLATTENED THE IMAGE AND SAVED AS A JPEG BUT ITS STILL A HUGE FILE. COULD YOU TELL ME WHERE IM GOING WRONG?? IM SO CONFUSED.

Most likely you increased the pixel count too high which inflated the file size required. An image that large is not viewed up close so you do not need to print it at a high resilution like 300Dpi. Pring an image that size at 100Dpi will be fine.
196cm x 143cm at 300dpi is 23150px by 16890px = 391,003,500px 391Mpixels
196cm x 143cm at 200dpi is 15433px by 11260px = 173,775,580px 174Mpixels
196cm x 143cm at 100dpi is 7717px by 5630px = 43,446,710px 43Mpixels
Your camera pixels are most likely nearer to 43Mpixels then to 391Mpixel intepolation can do just so much adding that many pixels will only produce a soft image anyway IMO

Black screen problem and file size

Like others I have been having trouble with importing from iPhoto to iMovie. At times everything works just fine but on my most recent project I have been having a terrible time with the preview screen being black. I have used this discussion forum to try and resolve the problem. I've tried many of the recommedations but the problem continues.
In one thread it was mentioned that file size might have something to do with the problem. I think there may be something to this. I've noticed that any file that is 1MB or less shows just fine in the preview window. Files between 1-2 MB seem to have an erratic pattern of loading and files above 2 will hardly ever load.
Unfortunately I seem to have a lot of photos in the latter category (taken on a recent trip to New Zealand). I'm hoping someone can give me some hints on how to reduce the size of these files in a "batch" fashion. Perhaps via Photoshop?
Also, has anyone else noticed any connection between file size and the black screen problem.
Thanks.
Alice
iMac G5 Mac OS X (10.4.8) iLife '06
iMac G5 Mac OS X (10.4.8) iLife '06

Matti,
Thanks for the reply but that isn't the problem I'm having. I've read plenty about not emptying the trash and have not done that.
The problem I'm having happens before the picture is even put in the timeline. When I click on media, go to iphoto and highlight a picture that I want to place in the timeline I will get a black preview screen with the scrubber arrow running across the bottom. Through a rather tedious process I think I have determined that the problem is related to file size. If the jpeg file is greater than 3MB it will not load. Jpeg files under 1MB load wonderfully. Those between 1-2MB are erratic in whether they load or not.

Photoshop and file sizes

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