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DPChallenge Forums >> Tips, Tricks, and Q&A >> Why color changed when uploaded to Challenge ?
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Showing posts 1 - 16 of 16, (reverse)
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 05/04/2004 09:03:59 AM · #1
After I upload the photos to the Challenge, the color of the photo didn't looked the same even on the same monitor (in fact, the same computer) as well.

Can anyone tell me a clue ?

Mainly uploaded files (preview in the upload page) seems tuned down the red color when compared to my original photo viewed from local harddisk.

Roger.
 05/04/2004 09:09:27 AM · #2
If you are working in the RGB workspace in PS or other editing program, you will want to Convert the colorspace of the image to sRGB prior to uploading to the web. The default colorspace of browsers is sRGB which has a smaller range of colors than what your photo probably captured. So when it's uploaded and viewed in your browser, the colors seem 'off'.
 05/04/2004 09:15:34 AM · #3
Originally posted by crabappl3:
If you are working in the RGB workspace in PS or other editing program, you will want to Convert the colorspace of the image to sRGB prior to uploading to the web. The default colorspace of browsers is sRGB which has a smaller range of colors than what your photo probably captured. So when it's uploaded and viewed in your browser, the colors seem 'off'.


Now that explains why my photos have only been in the low 5's! ;)
 05/04/2004 09:17:44 AM · #4
Originally posted by crabappl3:
If you are working in the RGB workspace in PS or other editing program, you will want to Convert the colorspace of the image to sRGB prior to uploading to the web. The default colorspace of browsers is sRGB which has a smaller range of colors than what your photo probably captured. So when it's uploaded and viewed in your browser, the colors seem 'off'.


I'll put this tidbit in my "Note to Self" file for sure! The things I did not know...this photography stuff is way harder than grad school ever was!
 05/04/2004 10:05:01 AM · #5
Originally posted by roger2000:
Mainly uploaded files (preview in the upload page) seems tuned down the red color when compared to my original photo viewed from local harddisk.

I'll bet you are talking about viewing your challenge entry in your photo editing program there when you say "original photo viewed from local harddisk". I have learned the hard way to always open the challenge entry file in a browser window to give it a final inspection before uploading to dpc. Most voters will be viewing your photo using Internet Explorer so take a moment and see how your final down-sized image will look to them.
05/04/2004 02:30:27 PM · #6
Originally posted by crabappl3:
If you are working in the RGB workspace in PS or other editing program, you will want to Convert the colorspace of the image to sRGB prior to uploading to the web. The default colorspace of browsers is sRGB which has a smaller range of colors than what your photo probably captured. So when it's uploaded and viewed in your browser, the colors seem 'off'.


Thanks. This is a great tip. My last three entries were crappy so far as colors are concerned. And no matter what I did, they looked washed out. It used to be not the case and it just became so frustrating. I've read countless how to's everywhere but they were not satisfying.

After reading your post, I looked at the color settings of my Photoshop ... and there it was, it was set at something else. Somehow it got changed, so now it's back to sRGB and voila, problem solved .

Thanks again.
 05/04/2004 02:33:23 PM · #7
Originally posted by laurielblack:
...this photography stuff is way harder than grad school ever was!


Tell me about it! I haven't been able to crack the 6 barrier yet...
 05/04/2004 02:38:01 PM · #8
Can anyone point out the equivalent RGB/sRGB setting in GIMP? Yikes, does anyone else use GIMP? :)
 05/04/2004 02:48:26 PM · #9
Originally posted by crabappl3:
If you are working in the RGB workspace in PS or other editing program, you will want to Convert the colorspace of the image to sRGB prior to uploading to the web. The default colorspace of browsers is sRGB which has a smaller range of colors than what your photo probably captured. So when it's uploaded and viewed in your browser, the colors seem 'off'.
If sRGB is a limited colorspace, what colorspace would be best for editing the image? I currently have PS set to edit in the sRGB space, but if there is a better option I would love to hear it.

David
 05/04/2004 02:57:03 PM · #10
I usually work in 16bit mode from a RAW image. I have my camera and workspace both set for RGB mode and work within that mode. I only convert out of that mode when I send a job to a printer/save for printing, or upload my image to the internet for web browsing. I have read, however, that the fuji frountier printer that you can find at most Wal-Marts, etc. use sRGB. So I'm not sure I'm buying myself anything by working in RGB... Gordon, can you add anything to this?

-danny

Originally posted by Britannica:
Originally posted by crabappl3:
If you are working in the RGB workspace in PS or other editing program, you will want to Convert the colorspace of the image to sRGB prior to uploading to the web. The default colorspace of browsers is sRGB which has a smaller range of colors than what your photo probably captured. So when it's uploaded and viewed in your browser, the colors seem 'off'.
If sRGB is a limited colorspace, what colorspace would be best for editing the image? I currently have PS set to edit in the sRGB space, but if there is a better option I would love to hear it.

David

05/04/2004 04:13:53 PM · #11
Well, I'm not Gordon, but I'll add my 2 cents. :D

You should be working your digital files up in the Prophoto colorspace if you want the widest gamut. It's even larger than Adobe1998. By working in a larger colorspace in 16bit mode your using more info to modify the image with. So when you resize or sharpen you can get better results. But it all dpends on your output. You could just capture everything in sRGB if the printer your using only supports that colorspace. It's only when you output to film that you would use the larger gamut. High quality ink jets and digital photo printers that expose the image to paper would also print the larger colorspace since they use more than 4 colors (CMYK).

Hope this helps,

05/04/2004 04:32:55 PM · #12
Thanks! I knew someone would have a better explaination.

-danny

Originally posted by MeThoS:
Well, I'm not Gordon, but I'll add my 2 cents. :D

You should be working your digital files up in the Prophoto colorspace if you want the widest gamut. It's even larger than Adobe1998. By working in a larger colorspace in 16bit mode your using more info to modify the image with. So when you resize or sharpen you can get better results. But it all dpends on your output. You could just capture everything in sRGB if the printer your using only supports that colorspace. It's only when you output to film that you would use the larger gamut. High quality ink jets and digital photo printers that expose the image to paper would also print the larger colorspace since they use more than 4 colors (CMYK).

Hope this helps,

05/04/2004 04:37:44 PM · #13
Originally posted by crabappl3:
If you are working in the RGB workspace in PS or other editing program, you will want to Convert the colorspace of the image to sRGB prior to uploading to the web. The default colorspace of browsers is sRGB which has a smaller range of colors than what your photo probably captured. So when it's uploaded and viewed in your browser, the colors seem 'off'.


Hey, wow! Thanks Danny!
 05/04/2004 04:39:26 PM · #14
Another thing to try is to make sure that when you save your image, it is saved at at least 75% quality. below that and the tonal loss affects perception of color.

Also remember that different browsers treat colors in different ways (to frustrate things further!).
 05/04/2004 04:55:44 PM · #15
Originally posted by crabappl3:
I usually work in 16bit mode from a RAW image. I have my camera and workspace both set for RGB mode and work within that mode. I only convert out of that mode when I send a job to a printer/save for printing, or upload my image to the internet for web browsing.


From your context, I presume you are actually referring to the Adobe RGB (1998) RGB working space.

The standard advice is that if you are going to edit high-bit input (e.g 16-bit RAW converted TIFF), then your working space ought to be a large one (e.g. Adobe RGB (1998)).

If you are going to edit low-bit input (e.g. 8-bit JPEG), then your working space ought to be the more appropriate, though small, sRGB space.

There are compelling technical arguments for the advice above. If you really want to read it, I can provide links.

Originally posted by crabappl3:
I have read, however, that the fuji frountier printer that you can find at most Wal-Marts, etc. use sRGB. So I'm not sure I'm buying myself anything by working in RGB.

What you are buying is greater color/pixel data fidelity when you do a lot of editing. Similarly, this is why you use layers instead of compounded edits in a single layer.

If your input contains much data (e.g. your 12-bit per channel camera device as stored/represented in a 16-bit per channel image format (TIFF)) then you want to preserve that data while editing, so you edit in 16-bit and use a large RGB working space.

Using sRGB as your target output device space for the Fuji Frontier is generally considered sufficient. However, it is more correct to obtain device profiles for your particular output device and soft-proof/convert using that profile. In the case of DPCprints, this means sometimes subtle and other times severe (yellows and greens in particular) color changes depending on which method you use in preparing your file for printing.
 05/06/2004 12:33:41 AM · #16
Wow, you guys are great.

Many thanks.

Roger.
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