How to use the command ppmtospu (with examples)
ppmtospu is a command that allows users to convert a PPM file to an Atari Spectrum 512 image. This command is useful for users who want to convert their PPM files into a format compatible with the Atari Spectrum 512 display.
Use case 1: Convert a PPM file to an Atari Spectrum 512 image
Code:
ppmtospu path/to/input.ppm > path/to/output.spu
Motivation: Users may have PPM files that they want to view or use on an Atari Spectrum 512 display. By converting the PPM file to the Atari Spectrum 512 image format, users can ensure compatibility and proper display of their images.
Explanation: The command ppmtospu is followed by the input file path, path/to/input.ppm, and the output file path, path/to/output.spu. The > symbol redirects the output of the command to the specified output file.
Example output: The PPM file at path/to/input.ppm will be converted to the Atari Spectrum 512 image format and saved at path/to/output.spu.
Use case 2: Use a dithering matrix of the specified size (0 means no dithering)
Code:
ppmtospu -d0|2|4 path/to/input.ppm > path/to/output.spu
Motivation: Users may want to apply dithering to their converted images to enhance the visual quality. With the -d option, users can specify the size of the dithering matrix to be used. A size of 0 means no dithering, while sizes 2 and 4 would use a 2x2 and 4x4 dithering matrix, respectively.
Explanation: In addition to the input and output file paths, the -d option followed by a number specifies the size of the dithering matrix to be used. The options 0, 2, and 4 represent no dithering, a 2x2 dithering matrix, and a 4x4 dithering matrix, respectively.
Example output: The PPM file at path/to/input.ppm will be converted to the Atari Spectrum 512 image format using the specified dithering matrix, and the result will be saved at path/to/output.spu.
Conclusion:
The ppmtospu command provides users with the capability to convert PPM files to Atari Spectrum 512 images. By specifying the input and output file paths, users can easily convert their PPM files and ensure compatibility with the Atari Spectrum 512 display. Additionally, users can choose to apply dithering to their images to enhance visual quality by specifying the size of the dithering matrix. Overall, the ppmtospu command is a versatile tool for manipulating PPM files and preparing them for display on the Atari Spectrum 512.
