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.
how to deactive this option
Toggle View>Proof Colors so it is not checked
....or ctrl + Y.
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