A Picture Compare session compares a pair of image files visually, showing the differences between them.

Aligning Image Content
You can compare images that have been resized, rotated, reflected or cropped.
Select View > Stretch to Same Size to automatically widen the thinner image and heighten the shorter image before comparison.
Select View > Rotate Clockwise or View > Rotate Counterclockwise to rotate the current image ninety degrees to the right or to the left.
Select View > Flip Horizontally or View > Flip Vertically to reflect the current image across its x-axis or y-axis.
If one image is a cropped version of the other, you can drag the mouse over the difference pane to adjust the position of the right image's top left corner. To reset the offset back to (0,0) select View > Reset Difference Offset or simply click on the offset display on the toolbar. For finer control, use the arrow keys to nudge the offset one pixel at a time, or Ctrl+arrow keys to move by a larger amount. Note that the difference pane must be selected for the keyboard nudge function to work.
Tolerance Mode
Select View > Tolerance Mode to have difference pixels indicate matches, unimportant differences, and important differences. It uses a configurable Tolerance to define the greatest degree of difference that is considered unimportant. You can also define Replacements to ignore specific color changes between images. By default, black pixels are used for matches, blue ones are used for unimportant differences, and red ones are used for important differences. You can change the colors to suit your preference. (See Picture Compare Options.)
Enable View > Ignore Unimportant Differences to ignore any differences less than or equal to the tolerance. They will be handled the same as matching pixels.
Mismatch Range Mode
Select View > Mismatch Range Mode to have difference pixels represent the degree of difference between the images. Black pixels are used for matches and yellow ones are used for differences. Brightness represents the degree of difference.
Binary Operation Mode
Select View > Binary Operation Mode to have difference pixels be the result of a boolean operation on the RGB (red/green/blue) values of the images. The binary operation can be XOR, AND, or OR.
Blend Mode
Select View > Blend Mode to use a configurable Blend percentage to combine the images. Decrease the percentage to make the right image more dominant.
See also
Picture Compare Commands
Picture Compare Settings
Picture Format Settings
Picture Compare Options
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