Photo.net Color Shifts

[gdanmitchell]

<p>For some time it has seemed to me that there are some not-so-subtle color shifts when uploaded

images are converted for display at photo.net.

 

<p>I noticed this again today after uploading a photograph from Death Valley and seeing the imaged

become somewhat reddish. To check this I opened three windows on my computer displaying three

versions of the same image:

 

<ol>

<li>The left image shows a portion of the photo as it appears in Photoshop before final conversion to

jpg.</li>

<li>The middle image shows a portion of the photo in the web browser after conversion to jpg and

displayed on a different web site (not photo.net). Color shifts here are not out of line for conversion to

jpg.</li>

<li>The right image shows a portion of the jpg version of the photo shown it the middle, viewed in the

same web browser, but after conversion to jpg and upload to photo.net. In other words, this is the image

that appears when viewed at photo.net.</li>

</ol>

 

<p><img src="http://d6d2h4gfvy8t8.cloudfront.net/5811642-lg.jpg">

 

<p>(Obviously, the colors here will no longer be accurate. Nonetheless, the relative differences should be

visible.)</p>

 

<p>I'm curious about what is going on here, and wondering what could be done to fix it. (I don't have this

problem when I upload to other services.

 

<p>Dan

[bobatkins]

I don't see it with my images. I just did a quick test. In the images below the upper half has been uploaded to photo.net can captured off the browser screen. The lower half is the original.

 

To me they appear identical.

 

The uploaded images were 510 x 200 pixels (cropped for the display below). No color profiles, nothing at all fancy in color space. In fact they were saved from Picture Publisher 8, an older image editor with no color space support!<div></div>

[ellis_vener_photography]

"The uploaded images were 510 x 200 pixels (cropped for the display below). No color

profiles, nothing at all fancy in color space. In fact they were saved from Picture Publisher 8,

an older image editor with no color space support!"

 

In other words they are slammed into sRGB.

[afs760bf]

Well, there are definitely some differences in the way Pnet displays photos compared to other web sites display of the samae photo. Sometimes its more prominent than at other times, I think depending on the color characteristics of the photo.

 

There is also still the compression problems, which can make a photo on the gallery front page and in the No Words forum look quite different than they look anywhere else.

 

Cheers.

[bobatkins]

Yes, they are sRGB by default, but that's exactly what most web browsers expect to see and all that they can deal with. Maybe Safari on a Mac (about 5% of all web users) can cope with other color spaces and profiles, but sRGB is pretty much the standard for the web.

[bobatkins]

Maybe any differences come from compression? I don't know if photo.net still compresses large images, but at one time I'm pretty sure that was done.

 

 

Have you tried uploading images that are, say 500 x 333 pixels and seeing if you still see color shifts?

[les]

I don't know: I do not see any color shifts in my images. The only difference is between TIFF image (Adobe 1998) and JPEG (sRGB obtained by Save For Web) - mostly in saturation, which in large degree can be equalized by increasing saturation +8 or +10 before Saving For Web.

[emre]

It does not happen to me either. It depends on whether your files are being recompressed. Sufficiently small files (I don't know the exact criteria, but I think it had something to do with the resolution) pass unscathed. Also remember to view your images using the Larger setting.

[paoloc]

Some my photos on PhotoNet have different colors after the upload.<br />

I save them converted in sRGB, but after the upload the colors are changed.<br />

I'm on a Mac with Firefox.

[paoloc]

An example:<br />

on the left from PN in Firefox,<br />

on the right on my Mac with Preview.<br /><div></div>

[emre]

A simple test: go to the Large preview, and read the size of the file by selecting the image properties with your browser. It should match your original file, save a possible ICC profile.

[paoloc]

Solved.

My problem is related to my workflow and my settings!

JPEG images generated from Nikon Capture NX (converted to sRGB) have different colors viewed in Firefox.

 

Thanks.