Why Is This Image So dark After Uploading? (FIXED)

[ HOSTED PHOTO DISPLAY FAILED: ATTACH id 701533 does not exist. ]


I've never seen this before. I've posted this image before in these forums, but after the change of format in POTN, this image is overly dark. What's happened?

Here's another one. It appears to be happening only to my B/W images.

[ HOSTED PHOTO DISPLAY FAILED: ATTACH id 701534 does not exist. ]

yogestee wrote in post #17313174

[ HOSTED PHOTO DISPLAY FAILED: ATTACH id 701533 does not exist. ]


I've never seen this before. I've posted this image before in these forums, but after the change of format in POTN, this image is overly dark. What's happened?

It is some issue with imagemagick I'm going to solve (I did not see it before not did beta testers). If you can PM me a link to the original that might help in solving this.

Colour pic is OK.

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Thanks for the quick reply Pekka, but these images have been uploaded directly from my computer's hard drive.

yogestee wrote in post #17313181
Thanks for the quick reply Pekka, but these images have been uploaded directly from my computer's hard drive.

No problem, it seems to happen only on b/w images. That is a start.

Thanks Pekka. Let me know how you get on.

It has nothing to do with B&W or Color. The CA plugins force the colorspace of the uploaded image to RGB, to ensure that the resulting image is displayable in a web browoser if it was originally CMYK. Apparently, in some builds of ImageMagick that force-to-RGB causes it to impose the sRGB colorspace, even if the image is already RGB, and (seemingly - haven't confirmed this) not perform any color management. The end result is a dark image. Depending upon which image processing back-end you're using there's a line of code that has to come out to prevent this.

There are some lines of code that need to be deleted. heres the article I found it in>>> http://www.collectivea​ccess.org …loaded-images-appear-dark

A way around it (for now):
Both of these pics are RGB .jpg. The first one is the original. All i did for the second one was take it into photoshop, go to images>modes, and select CMYK, then put it back to RGB and save. That kind of snaps it out of thinking it was CMYK even though it's in RGB.

Make sense?

Original .jpg in RGB

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BlakeC wrote in post #17320663
It has nothing to do with B&W or Color. The CA plugins force the colorspace of the uploaded image to RGB, to ensure that the resulting image is displayable in a web browoser if it was originally CMYK. Apparently, in some builds of ImageMagick that force-to-RGB causes it to impose the sRGB colorspace, even if the image is already RGB, and (seemingly - haven't confirmed this) not perform any color management. The end result is a dark image. Depending upon which image processing back-end you're using there's a line of code that has to come out to prevent this.

There are some lines of code that need to be deleted. heres the article I found it in>>> http://www.collectivea​ccess.org …loaded-images-appear-dark

A way around it (for now):
Both of these pics are RGB .jpg. The first one is the original. All i did for the second one was take it into photoshop, go to images>modes, and select CMYK, then put it back to RGB and save. That kind of snaps it out of thinking it was CMYK even though it's in RGB.

Make sense?

Original .jpg in RGB

Hosted photo: posted by BlakeC in
./showthread.php?p=173​20663&i=i55793615
forum: Forum Talk

Changed from RGB to CMYK then back to RGB and saved as .jpg

Hosted photo: posted by BlakeC in
./showthread.php?p=173​20663&i=i150343908
forum: Forum Talk

Sorry mate,,, you lost me..

yogestee wrote in post #17321428
Sorry mate,,, you lost me..

Yah me too! That's a pretty confusing post concerning "Color Modes" and "Color Space".

-Douglas- wrote in post #17321462
Yah me too! That's a pretty confusing post concerning "Color Modes" and "Color Space".

I appreciate any replies Doug.

I understand Color Space but I got a bit lost as I only use RGB.

I wanted to see if it would effect me as well.
I did a quick B/W (default) layer in PS CS6.
Working in RGB color mode, sRGB color profile.
I usually use the Save for Web option but just used
the Save As option for saving this one to jpeg. (started as a RAW .CR2)
I'm saving a screenshot of this screen, the"Preview & Save Draft" screen as I create this post
to compare with Photoshop. Done. So now I'll submit this post and see what happens.

Here is the screenshot vs. PS.
These were uploaded to Photobucket and the links copied and pasted into this editor.
I don't know if this has been any help at all but I didn't get the dark conversion others have got.

I think I'm getting somewhere. I made a duplicate and converted to CMYK and saved it, then converted back to RBG.

I'm still not sure what's going on!

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So this effect only happens if we 'attach' using the "Upload Images" option in the editor.

-Douglas- wrote in post #17324530
So this effect only happens if we 'attach' using the "Upload Images" option in the editor.

Yes, and with some b&w images only.