Adjust Your Color & Tone First in Mask Pro
Remember that Mask Pro 4 works based on color. If you image has a color-cast or is lacking contrast it can effect how well Mask Pro 4 works. You can often improve your masking results simply by doing your color-correcting and tonal adjustments before you use Mask Pro 4. Here is a quick way to get good results.
Step One With your image open, go to Image > Adjustments > Levels.
Step Two Click on the options button. Select Enhance Per Channel Contrast, enable the Snap Neutral Midtones check-box and set the highlight and shadow clipping to .10% If you don’t like the results try turning off the Snap Neutral Midtones option or using the Find Light and Dark Colors options.
Step Three Launch Mask Pro 4 and start masking