Posted By
IstvanV
on 2011-03-14
11:32:06
|  Re: Converting gfx made on PC
If you use p4fliconv to convert the image, the following need to be done for a lossless (if possible), pixel exact conversion:
- in the options, set "Dither" to "None"
- on the Advanced tab, make sure that "Disable interpolation" is checked
- for hires formats, either clear "Optimize for PAL color filtering", or set "Luminance search mode" to "MinRMSErr_YUV_Downsampled"
- save the image in GIF (not PNG or other) format, and make sure that it has a Plus/4 palette, with all colors in the correct order (color 0 = black, color 113 = white, etc.); if a transparent color is inserted as color 0 (shifting the other colors so that color 1 is black), it is not a problem. If the converter detects a file in this format, a special conversion mode is enabled, which avoids the errors resulting from searching for the Plus/4 colors nearest to those found in the input image
The following options have an effect only if you are converting to a multicolor format, or hires in "MinRMSErr_YUV_Downsampled" mode:
- Multicolor quality: set it to the maximum to avoid/reduce conversion errors
- MC chrominance error scale: if a lossless conversion is not possible, then the lower it is set, the less important the color information becomes relative to luminance
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