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07/23/2003 08:11:26 PM · #1 |
A LOT of people complain about their pic looked different in Photoshop vs when they upload it. I was just reading the Photosig FAQ and ran across this:
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Why do my photos look different on photoSIG than in Photoshop?
Your photo may look different on photoSIG for one of two reasons.
One possible reason is that your photo might have been scaled down by photoSIG. The maximum size of a photo is 640,000 pixels. The number of pixels is calculated by multiplying the width of the photo, in pixels, by the height, so while an 800x800 photo and a 1200x500 photo will not be scaled (being 640,000 and 600,000 pixels, respectively), a 900x800 photo (720,000) pixels would be scaled down. When a photo is scaled down, photoSIG sets the larger dimension of the photo to 800 pixels and then calculates a new value for the smaller dimension. A 900x800 pixel photo, for example, would be scaled down to 800x711.
The other possible reason is that you may be displaying your photos in Photoshop using a color profile other than sRGB. Every device that can record or reproduce color (for example, scanners, screens, and printers) has a different range of colors that it can record or reproduce. (This is an oversimplification, but will suffice for this explanation.) Since monitors almost always display a greater range of colors than printers, programs like Photoshop take the color reproduction characteristics of the ultimate output device into effect when displaying the photo on the screen. These reproduction characteristics are stored in a color profile, usually one that has the same name as the output device. If you tell Photoshop that you intend to print your photo on a printer, by selecting the printer's color profile, then Photoshop will show you how the photo will look after being printed. If you want Photoshop to display your photos as they will look on photoSIG, then you need to select the sRGB profile, which tells Photoshop that the ultimate output device for your photo will be the screen.
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That MAY explain it!
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07/23/2003 09:56:59 PM · #2 |
| I think it also has to do with the different way PS and the various browsers display the color, regardless of embedded profiles. To check, open the same JPEG with PS and your browser and compare .... |
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07/23/2003 11:26:52 PM · #3 |
Internet Explorer on the PC always renders JPEGs in the sRGB color space, even if a different color profile is included with the JPEG. That is why it is important to convert (and not just assign) your image to sRGB before putting in on the web.
For an interesting (and detailed) summary of Photoshop vs. web color presentation (especially if you are using a calibrated monitor), take a look at this thread.
I always work in sRGB, even though Adobe RGB has a larger gamut and my camera supports Adobe RGB JPEGs. (When shooting RAW it doesn't matter; you can assign any color space you want to your "developed" images at conversion time).
I believe that Safari (the broweser from Apple on the Mac) actually looks for embedded color profiles in JPEGs and uses the profile if present.
Message edited by author 2003-07-23 23:36:10. |
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07/24/2003 12:04:46 AM · #4 |
Originally posted by GeneralE:
I think it also has to do with the different way PS and the various browsers display the color, regardless of embedded profiles. To check, open the same JPEG with PS and your browser and compare .... |
That's because PS uses the colour profiles, and browsers don't. |
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07/24/2003 01:55:48 AM · #5 |
I'll preface my "tip" with the disclaimer that I really don't totally know the workings of PS, so while this worked for me, I can't say it's right.
I had the problem that I would fix images up in PS, then save them and view them in anything else, and they would be darker. What I finally discovered (if I remember correctly) was that by going to the View menu and doing one (or both) of the following things, the problem was resolved: either turning off "Proof Colors", and or choosing "Windows RGB" from the "Proof Setup" menu (or maybe it was Custom... with the appropriate profile selected?). Sorry for the vagueness, it's just been long enough that I don't remember which choice it was that eventually fixed it. I lean towards saying it was turning off "Proof Colors", because that's turned off now. But hopefully, if anyone's having this problem, this will at least get you going in the right direction. |
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