Photo mosaic — Hide
Cover or mosaic the selected area of the photo with black. Save a copy of the PNG with the covered area.
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Result
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How to use and processing criteria
A process of covering or mosaicking a rectangular area not to be shared with pixels from the image.
Actual example
Select the 20px on the left, 10px at the top, and 100×50px area, then click 'Hide Selected Area'. Black masking turns the selected pixels into transparent black, and no blue selection border appears in the result.
Frequently Asked Questions
What is the difference between Mosaic and black masking in privacy protection?
Mosaic retains color and structure, allowing content to be inferred. Sensitive content can be fully covered with black opaque masking and checked directly in the output. Faces, text, or reflections outside the selection are not found or masked automatically.
Can modify the masked area or revert to the original?
On the current screen, you can edit again by deleting regions or clearing all shadows. For saved PNG black shaded regions, black pixels replace original pixels. The original file is kept separately, so make sure you do not share it together.
Calculation criteria and reference materials
- MDN — Canvas image drawing
Cutting, arranging, and rendering new image pixels for the original area
Verification of calculation criteria: · Calculation·verification principles · Report errors