What version of photoshop and operating system are you using?
Are you using camera raw to complete the hdr process if your using photoshop cc?
I have Mac OSX Version 10.7.5 and am using the latest Photoshop software on the Creative Cloud.
The files are camera raw for the HDR process. Previously they did work, but between doing the latest update, I think it stopped working properly.
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It sounds like you have the Highlight Clipping Warning enabled.
If you press O on the keyboard, do the red areas disappear?
Also, you might have to reset the photoshop preferences, as the latest update sometimes messes with your preferences:
Ok. The deleting the preferences didn't work. However, when I went into the image again, I looked under history and clicked 'image size', which was right above '16 bits/channel'. The red disappeared. It looks like in converting it to 16 bits, the reds are appearing. I'm not sure where that leaves me! Will continue to play and see though.
Currently waiting to talk to Adobe Support about this. Have tried finishing the merge as 32 Bit then converting to 16Bit. The Local Adaptation presets seem to be causing the highlights to turn red and pixellated. Going into the history and removed the 16Bit rendering doesn't help, as the final image doesn't look the way the previously edited ones do.
Will update with result..
I think R_Kelly may have been right about the preferences settings. Adobe Support had me rename Adobe Photoshop CC Settings with _Old on the end. When I went back into Photoshop, the file looked just as bad as before. However, I then looked at two other HDR merge images and they were fine. I think the file is corrupt and will not look fine whatever I do.
Phew that's a relief...
Alas! I'm still getting these issues. Started a brand new project. Uploaded files. Did my usual HDR merge thing. Worked happily for 4 photos. Then all of a sudden I get the file corruption. HDR merge doesn't work and the photos end up looking like the image above.
Could it be my computer doing this? I don't think it can, since I can HDR merge the same three files in CS3 and there's no corruption. Except obviously I don't want to edit in CS3 anymore!
Any ideas from anyone?