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INK n, the foreground (pixel bit value of 1) color for an 8×8 pixel cell. And a value of 0 or 1 with the following statements to choose: BRIGHT n, sets the bright bit for both foreground and background colors in an 8×8 pixel cell. FLASH n, sets the bit that controls the flashing effect in an 8×8 pixel cell.
The ZX80 system font uses an 8×8 pixel-per-character grid where most glyphs fit in 7×6 pixels leaving one pixel horizontal space between them. This font was modified in the ZX81's ROM to slightly narrower 6×6 pixel glyphs with two pixels horizontal space between them, which improved the look of single inverted characters by showing inverted ...
A bitmap font is one that stores each glyph as an array of pixels (that is, a bitmap). It is less commonly known as a raster font or a pixel font. Bitmap fonts are simply collections of raster images of glyphs. For each variant of the font, there is a complete set of glyph images, with each set containing an image for each character.
The ZX81 system font uses an 8×8 pixel-per-character grid where most glyphs fit in 6×6 pixels leaving two pixels horizontal and vertical space between rows and columns. The ZX80's ROM which had slightly wider 7×6 pixel glyphs with only one pixel horizontal space between them.
A “1” bit indicates a rendered pixel. Each line is rounded to an 8 bit (one byte) boundary, padded with zeroes on the right. In this example, the glyph is exactly 8 pixels wide, and so occupies exactly 8 bits (one byte) per line so that there is no padding. The most significant bit of a line of raster data represents the leftmost pixel.
The bit string is 32 hexadecimal digits for an 8-pixel-wide glyph, or 64 hexadecimal digits for a 16-pixel-wide glyph. The goal is to create an intermediate format that would facilitate adding new glyphs. The bit string is converted from hexadecimal to binary. A 1 bit in the binary bit string corresponds to an 'on' pixel.
8-bit color, with three bits of red, three bits of green, and two bits of blue. In order to turn a true color 24-bit image into an 8-bit image, the image must go through a process called color quantization. Color quantization is the process of creating a color map for a less color dense image from a more dense image.
The actual glyph data immediately follows the header. Each bit in each glyph represents one pixel in the font: 0 for undrawn, 1 for drawn. Each row of each glyph is padded to a whole number of bytes. For example, a 12x12 font would have 2 bytes per row. The letter 'A' in a 12x12 PSF bitmap may look like this: