How do you change a color photo to grayscale while keeping all color information?

Where can you adjust the number of states that can be saved in the History?

Random bright and/or off-color pixels found in poorly compressed jpeg images are called...

You have two layers and want to hide all the white pixels on the top layer. What is one blend mode you can assign to the top layer?

Shortcut to the reuse last used filter on the current layer?

Which method combines a mask of an image with its negative to reduce blur in the image?

Which file formats are appropriate for saving a high resolution photographic image intended for publication on the web?

Which color mode below is not an option for Photoshop Image Color Mode?

Which tool can be used to select irregular objects?

Which image file formats are RAW formats?

Which one correctly depicts Graduated Filter of Camera Raw's toolbar?