In the title bar of an image, it tells you its color mode and bit mode. Sometimes, the monitor profile shows up as well, in this case CMYK, which is always checked in my machine.
But, if that is the case, what causes some RGB images to show that entire line and what causes it to sometimes just read (RGB/8)?
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You activated the proof colors switch (CMD+Y) for the images with two color modes in their tab.
Do it again to disable it, or you can go to the menu View>Proof Color to uncheck.
how to deactive this option
Toggle View>Proof Colors so it is not checked
....or ctrl + Y.
You're an angel! I just had this problem and I found the answer pretty easily here. Thanks! I won't be forgetting this one anytime soon! Cheers!
You are very welcome, I'm sure you can pay it forward, by helping someone else, you'll see, one can learn a lot along the way!
Been using Photoshop for decades and have never encountered this, even accidentally. Thanks!
This function lets you see how the image would look for instance in CYMK, while working in RGB, with all filters available.
It is also useful to check the values when painting, if you setup a greyscale preview.
scrolled down to thank you for your answer, only to see that I had already done so a year ago! hah! maybe this time it will stick
It's by accident most often where I work. In a production environment, people will accidently hit +Y instead of +U (for hue/saturation).