Bitmap Compression

For Cambridge IGCSE and AS & A Level Computer Science (0478 and 9618), paint a bitmap, choose its colour depth, then compare uncompressed, RLE and Huffman encodings.

Compare how the same bitmap is stored.

Paint the bitmap

Width Height Colour depth

Images are reduced to fit within 20 × 20 pixels.

Paint colour

Encoding

Original · uncompressed

Header

Bitstream

Bits are coloured by the image pixel they represent.