aero145
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Colour And Contrast Changes After Upload

Tue Mar 04, 2008 2:58 pm

Hello,

First; I know I’ve seen a similar thread a long time ago, about this, but I couldn’t find it.

Now, when I upload my images to A.net, the contrast and colour of them always changes; when compared to the images after they’ve been sRGB-profiled. I noticed this first last November, when a photo, that had IMO a bit too much contrast, was rejected of having too little contrast. It’s really annoying, as photos that look very good in Photoshop look too un-contrasty in the queue.

Here’s an example:


Colours and contrast before upload


Colours and contrast after upload

This is something I dislike; I remember something about ‘Adobe gamma’ affecting this, if so, what is to be done?

Many thanks,

Dave
 
flynavy
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:01 pm

I had a similar problem a while back. This is caused by Airliners.net removing embedded RGB profiles upon each photo being uploaded to the site.

I personally shoot raw and each time I open up a raw file to edit in CS3 I discard any embedded profiles to keep me on the same "page" as Airliners.net. Just makes sure your photo editor is using an sRGB color profile and you should be fine.

[Edited 2008-03-04 07:02:00]
Change is: one airline, six continents!
 
aero145
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:06 pm

The strange thing is that I AM using this sRGB profile. I may have to try that ‘discard embedded profiles’, though, thanks.
 
linco22
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:09 pm

I have also noticed some jpeg compression on recent shots uploaded has been 'added'.

Colin
 
flynavy
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:12 pm



Quoting Aero145 (Reply 2):
The strange thing is that I AM using this sRGB profile. I may have to try that ‘discard embedded profiles’, though, thanks.

No problem David. If I recall, there is also an option when saving files to not include any embedded profiles. The only thing that might be an issue if you just use that method is the imaged saved won't necessarily be the image edited - know what I mean?

As long as you discard any embedded profiles, though, you should be fine.  bigthumbsup 
Change is: one airline, six continents!
 
aero145
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:16 pm

Hi!

I did as you suggested - and the photos still again have been changed much after upload.

Getting really strange here - and yes, I discarded embedded profiles, and yes, I’m using Photoshop 10.
 
flynavy
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:19 pm

David,

Sorry I can't provide any additional insight. I have noticed no color disparities on my uploads recently.

 Angry
Change is: one airline, six continents!
 
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dvincent
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:21 pm

You're looking at the medium sized image which has a slight boost in contrast, saturation, and sharpness. The "large" format image is the same as your original (and is what the screeners look at).

If you're working in sRGB in Photoshop, you're fine. Even if the profile gets stripped it's what you'll see after upload - on the full sized image.
From the Mind of Minolta
 
flynavy
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:35 pm



Quoting Dvincent (Reply 7):
Even if the profile gets stripped it's what you'll see after upload - on the full sized image.

Not if you select "Use the embedded profile." I thought that might be what he was doing here...
Change is: one airline, six continents!
 
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dvincent
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 3:59 pm



Quoting Flynavy (Reply 8):
Not if you select "Use the embedded profile." I thought that might be what he was doing here...

Well, if you're honoring the embedded profile in PS, and it's something other than sRGB, then that's what's going to happen when you save it out and keep that color space. I was speaking only if his working space was sRGB.

This is why the Save for Web feature is handy, it has a conversion option in the triangle menu (in CS3 and I think in CS2 as well) that will always convert the file to sRGB on export.
From the Mind of Minolta
 
aero145
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 4:00 pm



Quoting Dvincent (Reply 7):
You're looking at the medium sized image which has a slight boost in contrast, saturation, and sharpness

Yeah? Well, the medium version looks bad enough, the big is worse, so I don’t understand why it would matter which size I’d choose.

It’s simply that I don’t use embedded profiles now, I use sRGB, and the image changes a lot after upload.
 
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dvincent
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 4:18 pm



Quoting Aero145 (Reply 10):
Yeah? Well, the medium version looks bad enough, the big is worse, so I don’t understand why it would matter which size I’d choose.

It does matter. They're two different things. The medium has stuff applied to it when it's generated (thumbnails and smalls do as well). Originals/large don't, unless you apply a watermark.

Your settings are wrong or you are confused. If you open up the color management settings window in Photoshop, what's your RGB working space set to?
From the Mind of Minolta
 
sulman
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RE: Colour And Contrast Changes After Upload

Tue Mar 04, 2008 4:24 pm

I had this issue 2.5yrs back with a Lynx I uploaded, I made a post in the forum about it. I was at a total loss to explain it. Believe it or not, I renamed the file and it was okay. It seemed impossible to me that that could be a solution, but it worked. Never happened before or since.

Edit: Post is here. I had a comparison shot in there - looks similar to yours.

James

[Edited 2008-03-04 08:33:51]
It takes a big man to admit they are wrong, and I am not a big man.
 
aero145
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RE: Colour And Contrast Changes After Upload

Wed Mar 05, 2008 11:06 pm



Quoting Dvincent (Reply 11):


Quoting Aero145 (Reply 10):
Yeah? Well, the medium version looks bad enough, the big is worse, so I don’t understand why it would matter which size I’d choose.

It does matter. They're two different things. The medium has stuff applied to it when it's generated (thumbnails and smalls do as well). Originals/large don't, unless you apply a watermark.

Your settings are wrong or you are confused. If you open up the color management settings window in Photoshop, what's your RGB working space set to?

Colour settings:

RGB: sRGB IEC61966-2.1
CMYK: U.S. Web Coated (SWOP) v2
Gray: Dot Gain 20%
Spot: Dot Gain 20%

Color Management Policies:

RGB: Off

CMYK: Off

Gray: Off



------

and so on


------

I’ve tried to edit photos again with the new settings, and upload the photos; but I do always see the same results.
 
aero145
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RE: Colour And Contrast Changes After Upload

Sat Mar 15, 2008 1:18 am

Here we go again:

http://farm4.static.flickr.com/3018/2334261466_6bf53a7f66_o.jpg
before

http://farm3.static.flickr.com/2360/2334261462_d122b3ed81_o.jpg
after




Seriously, I can’t find how to fix this, and neither Navy, David nor James have been of help in this - I seem to need more detailed help.  Silly

So you know, I’m using Photoshop 10.
 
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dvincent
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RE: Colour And Contrast Changes After Upload

Sat Mar 15, 2008 3:49 am

Here's a question. You on a Macintosh or a PC? The reason they look different is if you're using Safari, it honors color profiles tagged in images (which get stripped by the upload process). Therefore, after the profile is stripped, you're seeing the uplaoded version in the native Mac gamma/monitor color space which is brighter than sRGB.

I open them both up on Firefox (doesn't support color management) on my Mac and they're identical. Open them up in Safari (which has color management) and the original is different - because the profile is still tagged. They look identical on my PC, of which no browsers support color management (yet).

What's happening is that there isn't an ICC transform taking place - the profile is just being tagged to the image. You need to use "Convert to Profile" in Photoshop or use Save for Web and make sure that Convert to sRGB is checked. This way the colors will be the same even if the profile gets stripped.
From the Mind of Minolta
 
aero145
Posts: 2867
Joined: Tue Jan 04, 2005 4:59 am

RE: Colour And Contrast Changes After Upload

Sat Mar 15, 2008 9:36 am

Hi Dan,

Yes, I’m using Mac and Safari.

I’ll be downloading Firefox for the uploading purposes. This makes sense to me now - many thanks!

Now I’m out, going to use the sun.
-Dave

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