Image to raw data

[mos6507]

Does anyone know of a utility where I can take a monochrome GIF, BMP, or PNG and convert it into data suitable for an Atari display?

 

I'd like to slice this graphic down into 12 "columns" of 8-bit data for the bootup display for Chimera.

 

[Rybags]

I just do it with quick & dirty BASIC in the emulator.

 

Prepare the BMP with Photoshop, convert to indexed 8-bit colour using an Atari palette. Over-saturating the picture's colour first usually helps it get the conversion more correct.

 

Save as BMP, Image Inverted (since normal BMPs read from the bottom, up).

 

Read with a program in the emulator in Turbo mode. From memory, just skip the first 1078 bytes in an 8-bit paletted BMP.

 

From there it should be straight-forward. One byte per pixel with the value equivalent to what you'd POKE into a colour register to attain that colour.

[Heaven/TQA]

something like this (in turbo basic xl), when you want to use monochrome then you can do following

(assumung a 320x191x1 BMP)

 

0 gr.8+16:scr=dpeek(88)

1 open#1,4,0,"h:myfile.bmp"

2 bget#1,scr,1078

3 for i=0 to 191

4 bget#1,scr,40

5 next i

6 close#1

 

?

[SeaGtGruff]

Keep in mind, he's talking about Atari 2600 display, not Atari 800.

 

Michael

[CPUWIZ]

Does anyone know of a utility where I can take a monochrome GIF, BMP, or PNG and convert it into data suitable for an Atari display?

 

I'd like to slice this graphic down into 12 "columns" of 8-bit data for the bootup display for Chimera.

 

 

I'd be happy to whip up a quick command line tool in C and do that for you, is this the image you are happy with?