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Thread started 07 May 2009 (Thursday) 23:57
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Weird color shift

 
PKSmith
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May 07, 2009 23:57 |  #1

I seem to be having a weird color shift during my post processing, and I was wondering if someone could help me out. I'm using Aperture 2 on a Macbook Pro and Photobucket as a hosting site.

I get a color shift between what I see on my screen before I put pics on here and what appears on my screen. The colors that I see in Aperture match the exported .jpg files on my desktop, but once I host them to the web they change color. Every photo loses some vibrancy, and I don't know why.

I've got a couple of examples of what I mean. The first is a photo I posted a while back of my Jeep crossing a river. The file on my computer showed the car as being a very bright orange, while the photo here was drab and dull.

The second time I posted photos were from a recent baseball game. I had to over-process the colors so they would show up looking natural on here. I took a screenshot of the photo that is stored on my computer next to the one that is on photobucket, and there is a marked difference. Is there anything I can do to change this?


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Anke
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May 07, 2009 23:58 |  #2

Most web browsers use sRGB, convert to this colour space for display on the web. I suspect your computers colour space is not sRGB.


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PKSmith
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May 08, 2009 00:00 |  #3

Here is the picture of my Jeep. On my computer, it is a mind-blowing shade of orange.
https://photography-on-the.net/forum/showthre​ad.php?t=684152


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tim
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May 08, 2009 00:03 |  #4

Like Anke said make sure the images are sRgb. The differences in the first post of this thread are pretty minor, you'll never see the same in a non-color-managed app as you do in a color managed app.


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PKSmith
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May 08, 2009 00:44 |  #5

So what do I need to change the color space in? Aperture?


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Anke
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May 08, 2009 01:02 |  #6

PKSmith wrote in post #7880535 (external link)
So what do I need to change the color space in? Aperture?

You can continue to use Aperture in what every space you use, just convert the images to sRGB before uploading to the web. You might notice the slightest teensy tiny variation in colour but certainly not what you show here.
Or you can change your entire workflow/setup to sRGB, it's not the widest colour space but if you only send to the web then maybe its the best.


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PKSmith
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May 08, 2009 02:47 |  #7

I did a lot of searching through Aperture, and finally found the color space for exported images, and it already was in sRGB with a bunch of letters and numbers after it. IEC something or other. However, I was able to change the gamma setting for exported images so they more closely match the ones on the web.


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PKSmith
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May 08, 2009 03:12 |  #8

Ok, nevermind. I got it so the exported pics look the same as the ones already on the web, but new uploads from my computer are washed out even more. I'm going to bed. I'll deal with this later.


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René ­ Damkot
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May 08, 2009 06:10 |  #9

Have a read in the link from my sig...

OSX is color managed, most browsers (except Safari, and FF3 if set up to be) are not color managed, so will display wrong. If you don't embed an icc profile, safari will display an image wrong, FF3 will display an sRGB image correct.

As said: Use sRGB jpgs for web.

To check your browser: Link (external link)


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May 08, 2009 09:16 |  #10

After export from Aperture, open an exported file in another app (PS, etc.) and make sure the sRGB profile has actually been embedded in the image - ie, use the appropriate "Inspector" (in Preview) or "File Info" or "Properties" type option to confirm the file has the profile embedded. For example, in Preview, use the "Tools>Inspector" menu item, and look in the "General" tab, at the bottom of the window. I don't use Aperture, so I apologize if this check is redundant. I am also not a Photobucket user - do they strip color profiles from the images you post there? Just throwing that out there, I have no idea if it is even possible.

Also, your reference to the Jeep water crossing photo - that image does not show a "very bright orange" body panel on my calibrated MacBook Pro. The below is a screenshot of the image - Photoshop CS3 on left, Preview on right. The image itself has the sRGB profile embedded and the images are essentially identical. Is your MBP calibrated with a device like an iOne or Spyder, or have you just eyeballed the screen's calibration? This is a separate issue from the image's sRGB issue.

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May 08, 2009 14:27 |  #11

I checked, and all images have the sRGB profile after export. However, I haven't ever calibrated my screen.


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May 08, 2009 15:18 |  #12

Alright, I think that I figured it out. Preview and Aperture may show that the picture is in encoded with sRGB, but they are both displaying in AppleRGB, which has much brighter colors. I redid the processing on a photo in DPP, and sent it to Photobucket, where it looked almost identical. If the pics weren't overlapping, it would be very hard to tell a difference.


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May 08, 2009 15:41 |  #13

I would suggest you read this thread...

https://photography-on-the.net …php?p=7833130#p​ost7833130

...but then you would begin to appreciate the very low level of understanding and expertise in resolving the problem of displaying images with different applications, in spite of color management efforts you have made to make your monitor and printer match each other. :confused:


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May 08, 2009 15:42 |  #14

Go to "System Preferences > Displays" and go to the "Color" tab. You can press the "Calibrate" button to "calibrate", at least by eye, the monitor and use this as your display profile. Eventually, if it makes a difference to you, you can invest in, or borrow, a device to do a more accurate job - something is better than nothing. This screen shot is from my Mac Pro / Cinema DIsplay, but you get the idea. The monitor profile shown here was generated with an XRite iOne Display.

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René ­ Damkot
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May 09, 2009 11:10 |  #15

PKSmith wrote in post #7884144 (external link)
but they are both displaying in AppleRGB

No they don't. Unless you have your display settings in the OS wrong. Use your monitor profile as monitor profile there.

Calibrate your monitor, and use gamma 2.2

PKSmith wrote in post #7884144 (external link)
I redid the processing on a photo in DPP, and sent it to Photobucket, where it looked almost identical. If the pics weren't overlapping, it would be very hard to tell a difference.

DPP is color managed, but you need to tell it where to find the monitor profile (prefs)
Assuming you use Safari, and the images have an embedded profile, it's color managed as well. In that case, the image should look identical in DPP and Safari (and PS, and preview, and whatever color managed application)

If you didn't tell DPP what monitor profile to use, it'll default to sRGB. If you didn't embed a profile in the images, Safari will assume monitor profile. In both cases you won't have a match.


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Weird color shift
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