Gameboy Development Forum

drev · 2023-11-12 16:02:40

Hello, I am using png2asset on a png file that contains only black on white

Code:

png2asset "./assets/text.png" -c "src/graphics/text.c" -spr8x8 -tiles_only -noflip # noflip because W is a reversed M

The generated tiles are however not black on white but grey on white (#aaaaaa)

Code:

const uint8_t text_tiles[608] = {
    0x00,0x00,0x3c,0x00,
    0x66,0x00,0x66,0x00,
    0x66,0x00,0x66,0x00,
    0x3c,0x00,0x00,0x00,
    
0x00,0x00,0x18,0x00,
    0x38,0x00,0x18,0x00,
    0x18,0x00,0x18,0x00,
    0x3c,0x00,0x00,0x00,
    
0x00,0x00,0x3c,0x00,
    0x4e,0x00,0x0e,0x00,
    0x3c,0x00,0x70,0x00,
    0x7e,0x00,0x00,0x00,

...

when I put a grey pixel anywere in the source png file, the text is black.

Is it a known issu with png2asset or did I missed a flag ?

Last edited by drev (2023-11-12 16:04:39)

toxa · 2023-11-13 07:27:49

1. why do you use the metasprite mode, while it is much better to use the tilemap mode (-map, not -spr8x8)?
2. you can use indexed PNG with only 4 colors and use -keep_palette_order.

Last edited by toxa (2023-11-13 07:28:04)

drev · 2023-11-14 00:41:07

Thank you, it worked using -keep_palette_order and indexed mode.
For information, under gimp I changed to indexed color mode using the image/Mode menu and selected 4 colors
https://docs.gimp.org/en/gimp-image-con … dexed.html
Since the image only have 2 colors the I had to manually add 2 more colors using the Colormap dialog
https://docs.gimp.org/en/gimp-indexed-p … ialog.html

Last edited by drev (2023-11-14 00:44:18)

toxa · 2023-11-14 05:17:25

yes, usually, when you have more or less large project with many assets, it is important to make conversion process predictable and same for all the images in the project. -keep_palette_order and indexed png images is the best way to achieve that

Gameboy Development Forum

Ads

#1 2023-11-12 16:02:40

png2asset with black and wite png (no grayscale)

Code:

Code:

#2 2023-11-13 07:27:49

Re: png2asset with black and wite png (no grayscale)

#3 2023-11-14 00:41:07

Re: png2asset with black and wite png (no grayscale)

#4 2023-11-14 05:17:25

Re: png2asset with black and wite png (no grayscale)

Board footer