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README.md

bmp2sms

this tool was only tested with TCL 8.6.*

basically a 'clone' of bmp2tile made by Maxim rewrote it as a TCL study and most importantly with portability in mind

its purpose is to convert 16 colors images files to a format suitable for inclusion in Sega Master System programs (written with wla-dx but other tools may work as well)

bmp2sms support PNG/GIF/PPM/PGM by default without the TkImg package and BMP/JPEG/PCX/XPM/TGA with TkImg images should have a width / height that are multiples of 8 otherwise padding will be added.

there is some things differing from bmp2tile:

  • target system is the Sega Master System (no support for Game Gear altough adding it would be easy)
  • the program perform 'smart' colours conversion if image colours does not match the SMS palette
  • indexed images are loaded as normal images (the palette is ignored), a palette is instead automatically generated
  • it load a complete directory instead of only one file at a time, there is planned support to save all files in one go
  • some features from bmp2tile are missing like 8x16 mode and cl123 palette output mode
  • palette order may be different so tiles value may be different on the same image (because bmp2tile will load indexed images while bmp2sms always generate it)
  • allow negative tile start index (-1 = 0x3ff etc.) which may be useful for some effects
  • no commandline mode
  • no status bar

then there is some features:

  • palette index picker (click somewhere on the image)
  • palette editor (double click on a palette color square or drag around a color square to organize the palette)

if the package TkImg is found then these additional images format will be supported: BMP/JPEG/PCX/XPM/TGA

TkImg can be installed easily with a package manager, example : sudo apt install libtk-img

this program also support compression plugins made for bmp2tile, this feature require the Ffidl Tcl package

Note for .bmp images: The image should not include colour space information (see BMP export compatibility options for GIMP) otherwise the image will fail to load.

this is a first try at TCL, an interesting programming language with great libraries

Usage

tclsh8.6 bmp2sms.tcl

Screenshots

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Tool to convert 16 colors images files (PNG/GIF/PPM/PGM) to a format suitable for inclusion in Sega Master System programs.

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