Command line and GUI ZX Spectrum graphics conversion tools
Open chris-y/ppmtoscr on github
amiga zx-spectrum 
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Closest projects to ppmtoscr in the index. If they solve the same problem, the maintainers may gain more from collaborating than from building in parallel.
Amiga & Atari bitmap converter for demos
Converts graphics of old school computers to modern formats like PNG, JPG, TIFF, GIF
Convert images to retro text-mode ASCII art for ten classic platforms — Apple II, Commodore, Atari, ZX Spectrum, Amiga, MS-DOS — with native fonts, hardware palettes, and a live crop tool. macOS / SwiftUI.
Converts modern images to retro formats: Apple II, IIgs, C64, Amiga, Atari ST, ZX Spectrum, Amstrad CPC, MSX, PC, and more
PPT is an image processing software for the Commodore Amiga computers
PNG/JPEG to Commodore Amiga graphics converter — OCS/AGA bitplane, HAM6/HAM8, EHB, copper palettes, 64 dithering modes and much more
Trimmer for Tosec Amiga and Atari ST floppy images of releases (games) to make 1g1r
Converts images to Amiga OCS/ECS 12-bit color with palette reduction and dithering.
Converts RGB images (png, jpeg, etc.) to IFF/ILBM files tailored for Amiga OCS/ECS (Amiga 1000, 2000, 3000, 500, 500+, 600).
Calculate Amiga, Atari STe and Atari ST palettes, gradients, rasters and fades. Assembler samples included.
GUI tool to convert binary files to DOS Object OBJ/OMF,COFF, Amiga Hunk, and GWBASIC BSV format. Creates byte exact files as Turbo Pascal BINOBJ and Turbo C BGIOBJ. Can be used with Turbo Pascal, QuickPascal,...