If you want to convert a picture to enterprise and not to 256 Col mode, then EPIMGCONV is the best tool for it.
Here is one of the pictures from the Col256 demo converted in various modes:
Original image
[ Guests cannot view attachments ]
Col256
[ Guests cannot view attachments ]
epimgconv 256-color mode (no interlace)
[ Guests cannot view attachments ]
[ Guests cannot view attachments ]
epimgconv 16-color mode (no interlace)
[ Guests cannot view attachments ]
[ Guests cannot view attachments ]
epimgconv attribute mode (interlace)
[ Guests cannot view attachments ]
[ Guests cannot view attachments ]
yes, I see format nd description of rgb values. I have dump of picture (indexed values and palette - R,G,B) and now i am looking to conversion.
If the conversion can only be lossy, or it requires finding an optimized palette/bias on the EP, then one possible solution is to convert the data to an image format that is recognized by epimgconv, and then convert that. It supports the XPM format, which is simple text, so it can easily be created in a program you write, or even a text editor.
Otherwise, it could be converted with a small program or script written specifically for this conversion.