Copied images are inverted white to black since the update to El Capitan - any ideas as to how to switch back?

I suspect this is to simplistic of an interpretation of your question. since I do not fully grock the problem.

You can change the surrounding back ground color in Preview:

I do know tiff files have always been a problem in web design and interface issues. As well gif give me a problem on my own computer.

Have you tried changing the format of these images in order to gain some control?

charlesfromaitkin wrote:

I have found if I take a screen shot of the image - that works just fine - but I lose a little of the resolution and also need to take a couple of tries to get all I wanted. I even tried to paste into Pages and that turned from white to a black image also.

Instead, save the image as PNG and see if copying that still shows the problem.

Where did you get the tiff form? Does it have an alpha channel in it? Tiff files with alpha channels don't work in many apps including Preview and Powerpoint, at least not for me.

Convert the tiff files to jpeg and they can be added to PowerPoint. I was able to do the conversion with GraphicConverter, Photoshop and Photoshop Elements. I'm sure there are other image editors that can handle the file.

EDIT:

Opps. Missed you post regarding converting to png. 😟

I cannot reproduce this.

As a workaround, you may try leroy's suggestion to save as different format like png, and see if that works.

But I am guessing that there may be some software that you have installed and is causing a conflict.

You could run Etrecheck and post its report here so we can look for a possible conflict.

charlesfromaitkin wrote:

Using "Press the Control-Option-Command-8 key combination" just gives me a beep?? And the window background only changes the background - I need the image to switch. Any other things???

Try it through System Preferences > Accessibility > Display > Invert Colors

charlesfromaitkin wrote:

I have found if I take a screen shot of the image - that works just fine - but I lose a little of the resolution and also need to take a couple of tries to get all I wanted. I even tried to paste into Pages and that turned from white to a black image also.

Bug Reporter https://bugreport.apple.com/

charlesfromaitkin wrote:

Not familiar with "Etrecheck" - but I would have very little added to this computer.

Etrecheck is a little utility by one major contributor in these forums. Its report tells us about the hardware and software on the computer.

In many circumstances it has helped solve problems. As it turns out, many of the problems people have experienced in EC come down to software incompatibilities from programs that were not updated; antivirus; and "cleaner" programs. From the Etrecheck report these usually become apparent.

Press the Control-Option-Command-8 key combination.

Mac OS X displays inverted image colors (white on black, reverse type) - Apple Support

Where is this happening?

Photo.app ? Preview.app.?? Files in folders???