The last few images I have posted to a gallery have a color shift in the smaller versions but if you open the larger versions the color is fine. Anyone else noticing that issue ? If so, how can I resolve it ?
See my doe and fawn image in the wildlife gallery I posted today. (1/3/18).
Andrew, just took a quick look, and yes you're correct and I see the change there. Do you upload both a Maximum size image and a Standard size image when posting images. Or, do you let the system create the smaller Standard image off of the Maximum sized image you've posted?
I cannot say that would be the direct cause, but just thinking out loud and a possible point to review. I always upload 2 separate images to any posts I've made and I cannot say I've ever seen a color shift like I saw with your image.....
Posted by Igor Doncov on January 3, 2018 at 10:21 PM
Make sure both versions have been converted to sRGB for consistent color.
Make sure both versions have been converted to sRGB for consistent color.
A good key point, Igor.
Yes, another reason to make sure you mount both Maximum and Standard size images that are identically processed excluding obviously the final image overall sizes.
The shift in color and contrast in your image is noticeable. This issue has been known for some time, and has been mentioned several times. The leading theory is that if one allows the gallery software to generate the small version from the large version, the color profile info (alpha channel) is stripped when the small version is created.
The solution is to upload two images--one large, and one small, as Paul suggested. Also, as Igor noted, be sure that the sRGB color profile is 'embedded' in both files.
Until this issue is fixed, it is best to upload two images.
--P
Posted by Lon Overacker on January 4, 2018 at 1:19 PM
While of course one must convert to sRGB, that WILL cause issues in non color-managed browsers. And I have always uploaded a 720px and larger views separately, so I can't say whether or not it's the NPN resizing that is causing this. That may be yet a separate issue.
This manifests itself not just as a color shift, but contrast, saturation and luminosity are almost always better in the larger upload. Many times the smaller 720 original post is flatter, lacks shadow detail, etc. I've often made the comment, "the large view opens up nicely" In fact look at one of Harry's recent posts where there is a clear difference in the shadow detail in the left of this image between the original and large views.
I wish I had a solution or suggestion, but alas all I can do is point out the issue.
Thanks to all who replied. I just posted another image to the wildlife gallery. Used Adobe RGB and posted both sizes. All good.
Another reason why I love NPN is what I learn from asking questions and the comments on my images.
Stay warm.
Posted by Richard Ditch on January 4, 2018 at 9:29 PM
I'm sure I've written a similar reply many times here at NPN on this topic.
This all points to color space and color profile problems that are amplified by browser's ability to recognize embedded profiles and how they respond to images without a profile.
If you really want to control how your images look to other viewers on the web:
Convert your image from whatever color space you worked in to sRGB before uploading
Embed the sRGB profile in the image before uploading
Beware of Save for Web - it can strip out embedded color profiles if you don't check the proper boxes
Prepare and upload separate images for each size (720px and 1200-1600px)
Be sure that everyone who views your images uses a color aware browser (like Safari on a Mac). Just kidding.
Posted by Keith Bauer on January 8, 2018 at 9:35 AM
I have written about this problem for at least the past two years. The issue is when only uploading the larger version, when the NPN software creates the smaller version it does not honor the embedded color space. This was one of the highest priority items on the list created more than a year ago of things to fix. Unless the resources are allocated to Dave the Programmer (DTP), this will continue to be an issue. It should have been addressed a LONG time ago as many times as it has been pointed out.
Discussion
8 repliesSee my doe and fawn image in the wildlife gallery I posted today. (1/3/18).
Thanks
I cannot say that would be the direct cause, but just thinking out loud and a possible point to review. I always upload 2 separate images to any posts I've made and I cannot say I've ever seen a color shift like I saw with your image.....
A good key point, Igor.
Yes, another reason to make sure you mount both Maximum and Standard size images that are identically processed excluding obviously the final image overall sizes.
The shift in color and contrast in your image is noticeable. This issue has been known for some time, and has been mentioned several times. The leading theory is that if one allows the gallery software to generate the small version from the large version, the color profile info (alpha channel) is stripped when the small version is created.
The solution is to upload two images--one large, and one small, as Paul suggested. Also, as Igor noted, be sure that the sRGB color profile is 'embedded' in both files.
Until this issue is fixed, it is best to upload two images.
--P
While of course one must convert to sRGB, that WILL cause issues in non color-managed browsers. And I have always uploaded a 720px and larger views separately, so I can't say whether or not it's the NPN resizing that is causing this. That may be yet a separate issue.
This manifests itself not just as a color shift, but contrast, saturation and luminosity are almost always better in the larger upload. Many times the smaller 720 original post is flatter, lacks shadow detail, etc. I've often made the comment, "the large view opens up nicely" In fact look at one of Harry's recent posts where there is a clear difference in the shadow detail in the left of this image between the original and large views.
I wish I had a solution or suggestion, but alas all I can do is point out the issue.
Lon
Another reason why I love NPN is what I learn from asking questions and the comments on my images.
Stay warm.
This all points to color space and color profile problems that are amplified by browser's ability to recognize embedded profiles and how they respond to images without a profile.
If you really want to control how your images look to other viewers on the web:
- Convert your image from whatever color space you worked in to sRGB before uploading
- Embed the sRGB profile in the image before uploading
- Beware of Save for Web - it can strip out embedded color profiles if you don't check the proper boxes
- Prepare and upload separate images for each size (720px and 1200-1600px)
- Be sure that everyone who views your images uses a color aware browser (like Safari on a Mac). Just kidding.
Take a look at this web article.