Feat: Add ignore-areas#95
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Ignored area is defined by passing position (from the upper left corner), width and length of the rectangle.
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Added an --ignore-area feature that allows users to define one or more rectangular regions to be excluded from PDF comparisons. Multiple rectangles can be specified as a ;-separated list (e.g. --ignore-area="10,10,50,100;20,20,50,100).
This is useful for documents that contain dynamic content such as serial numbers, timestamps, or unique identifiers reoccurring on every page at the same position. In my use case, each generated document contained one or more unique codes (data matrix codes) at fixed positions on the page, causing otherwise identical PDFs to be reported as different.
Pixels within an ignored area are excluded from the pixel-diff count and don't trigger the page-differs flag, but are still rendered using the original (unmodified) page content rather than the diff color overlay. In the output diff PDF, ignored areas are additionally marked with a dashed gray outline so it's clear they were excluded intentionally rather than simply matching.