First public commit.

lenser/coleco/convert/__init__.py

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+"""ColecoVision / Adam conversion dispatch.
+
+Both machines use the same TMS9918A VDP as the TI-99/4A, so the Graphics Mode 2
+image encoding (palette + 6144-byte pattern + 768 per-cell colours) is identical
+-- we reuse the TI-99 GM2 encoder unchanged.
+"""
+from __future__ import annotations
+
+from ... import imageprep
+from ...ti99.convert import gm2 as _gm2, mono as _mono
+
+_MODULES = {"gm2": _gm2, "mono": _mono}
+MODES = ["gm2", "mono"]
+
+
+def convert_image(path_or_img, mode="gm2", palette_name="tms9918",
+                  dither_mode="floyd", intensive=False, prep_opt=None, base_color=None):
+    prep_opt = prep_opt or imageprep.PrepOptions()
+    module = _MODULES.get(mode, _gm2)
+    img_rgb = imageprep.prepare(path_or_img, module.WIDTH, module.HEIGHT,
+                                module.PIXEL_ASPECT, prep_opt, border_rgb=(0, 0, 0))
+    conv = module.convert(img_rgb, palette_name, dither_mode, intensive,
+                          base_color=base_color)
+    conv.viewer = "coleco"
+    return conv