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Image analysis tools

Analysis tools read an image and answer a question about it instead of changing it. The format check tells you whether a file really is a PNG or something renamed with a .png extension, the file size tool reports how heavy the file is in kilobytes, and the orientation tool reads the size and the shape of the picture. These are quick facts, useful before you decide whether to resize, recompress or re-save anything.

Color analysis goes deeper. The transparency check reports whether the image has an alpha channel and whether any pixel is actually see-through, the grayscale check reports whether all pixels share the same value in the three color channels, and the two-color check reports whether the image uses exactly two distinct colors - the signature of a simple logo or icon. Extract color reads the dominant color out of the picture.

The pixel viewers are the visual counterpart: they highlight the pixels that match a condition, so you can see where the transparency is, where the grays are, where the light and dark areas are, and where the unique colors hide. Use them when an image looks wrong and you need to know which pixels are responsible before you touch anything.

Tools in this category

Extract a color from an image Keeps only pixels close to the chosen color and makes everything else transparent — the inverse of Remove Color. 01 Show transparent areas in an image Highlights every transparent or semi-transparent pixel with the chosen color so gaps become obvious. 02 Show grayscale pixels in an image Finds pixels whose channels are nearly equal and renders them as a mask. Tolerance is in channel units. 03 Show color pixels in an image Finds colored (non-gray) pixels beyond the channel tolerance and renders them as a mask. 04 Light pixel mask Selects pixels brighter than the luminance threshold. 05 Dark pixel mask Selects pixels darker than the luminance threshold. 06 Unique color mask Selects colors that occur no more than the given number of times — rare and one-off pixels. 07 Check if an image really is a PNG Checks the signature of pasted base64 / data-uri content and reports whether it is a real PNG. 08 Check if a PNG is grayscale Reports whether the image consists only of shades of gray. 09 PNG file size checker Encodes the image as PNG and reports the resulting file size. 10 Check if a PNG is transparent Reports whether the image contains transparent or semi-transparent pixels. 11 Check PNG orientation: portrait, landscape or square Reports whether it is portrait, landscape or square. 12