I want to adjust the colour in a large image. It is 800Mb, stored as TIF/LZW. Because it is such a large image, I made a thumbnail (1280x554 pixels), adjusted the colour and saved the changes I made with Image/Adjustments/Variations as an AVA, then I loaded the original and tried to apply the AVA file. I got a message along the lines of "Can't do that - it's the wrong sort of file." I checked Image/Mode and the original is RGB Color and 8 bits/channel. What else could be wrong?
JFI: I am a complete noob to Photoshop and have never used any version prior to CS3.