Creating and Applying a Mask that Excludes All Differences

Click Differences > Show to open a Differences window, if one is not already open.
Click Differences > Convert to Mask. A message is displayed: Bitmaps are now identical on screen.
Click OK. The bitmap tool creates an untitled mask bitmap from the Differences window, swapping black and white, and applies the mask to the baseline and result bitmaps.
Choose one of the following actions:

Keep the baseline and result bitmaps with the mask applied

Save the bitmap files. The mask is now a permanent part of the bitmap files.

Unapply the mask

Close the mask bitmap window. Saving is optional.

Keep the mask as it is

Save the mask file.

Edit the mask

Choose File > Save and close the mask bitmap window. This un-applies the mask.

The Open Agent and Classic Agent capture bitmaps in different color depths. By default, the Open Agent captures bitmaps using the current desktop settings for color depth. The Classic Agent captures bitmaps as 24-bit images. If you create a mask file for the captured bitmap using the Bitmap tool, the mask file is saved as a 24-bit bitmap. If the bitmap mask file does not have the same color depth as the bitmap that you capture, an error occurs. To ensure that VerifyBitmap functions do not fail due to different color-depth settings between the captured image and the mask image, ensure that the bitmaps have the same color depth.