Generator for photomosaics.

Metapixel is a program for generating photomosaics. It can generate classical photomosaics, in which the source image is viewed as a matrix of equally sized rectangles for each of which a matching image is substitued, as well as collage-style photomosaics, in which rectangular parts of the source image at arbitrary positions (i.e. not aligned to a matrix) are substituted by matching images.

• Metapixel generates not only classical mosaics but also collage-style photomosaics (see examples).
• The matching algorithms match not only color but also form.
• Metapixel is fast. It takes about 75 seconds to generate a classical photomosaic for a 2048x2432 image with constituent images of size 64x64 and a database of slightly more than 11000 images on my not-so-fast Alpha. Most of this time is spent loading and saving images.
• Metapixel can generate classical mosaics which contain at most one copy of each constituent image. Alternatively, Metapixel can be instructed to honor a minimum distance between two occurrences of the same image in classical photomosaics.
• Metapixel has a cheat option which overlays the photomosaic with the original image using a user-specified percentage. Small percentages yield noticable improvements but are innocent enough so as not to be noticed without close inspection.
• Metapixel is a command-line program and thus scriptable.

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