74 lines
3.3 KiB
Markdown
74 lines
3.3 KiB
Markdown
# Rgb2Hires
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Rgb2Hires is a set of tools to help convert a modern RGB image (JPEG, PNG) to the HIRES format for Apple II computers, either as a binary export or an assembly listing.
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The colors of the RGB image can be approximate: Rgb2Hires will match them with the nearest HIRES color.
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## Apple II colors
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RGB values of the targeted colors:
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* **BLACK**: 00 00 00
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* **WHITE**: FF FF FF
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* **BLUE**: 07 A8 E0
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* **ORANGE**: F9 56 1D
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* **GREEN**: 43 C8 00
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* **VIOLET**: BB 36 FF
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## Projects
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This repository contains three "PC" projects:
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* **libRgb2Hires**: a library to convert an RGB image to the Apple II's HIRES format
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* **Picture**: a program to convert an RGB png to a binary or an ASM excerpt that can be loaded into the HIRES memory pages of an Apple II. An optional **live preview** can be displayed: its window will simulate an RGB monitor and will show the result, including color clashing and artifacts.
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* Source image must be 140x192. Pixels are anamorphic: they will be displayed twice as wide as they are tall.
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* Source image must contains six colors: BLACK, WHITE, ORANGE, GREEN, BLUE and PURPLE. The colors may be an approximation of the six Apple II colors. Please refer to the provided pic.
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* **Tile**: given an RGB png tile sheet that satisfies the same requirements as above, it extracts a 14x16 tile and converts it to ASM data. The lines forming the tile data **are not interleaved** as in a HIRES framebuffer.
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And one Apple II project:
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* **Loader**: a program that will load and display a picture generated by the *Picture* program. A bash script is provided as an example to load the picture and the loader onto an image disk. [AppleCommander](https://applecommander.github.io/) is required to do so. Once in ProDOS, just type *-DISPLAY*.
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__Note:__ For more information about the "Hires" format and its limitations, you can refer to my [website](https://www.xtof.info/hires-graphics-apple-ii.html).
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## Build from sources
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### Dependencies
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The dependencies are managed by [conan.io](https://conan.io/). Please refer to [their documentation](https://docs.conan.io/en/latest/installation.html) for installation instructions.
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The build system is managed by CMake.
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### How to build
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```bash
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mkdir build && cd build
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conan install ..
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cmake .. -DCMAKE_BUILD_TYPE=RELEASE
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cmake --build . --config release -j
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```
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## Apple II project (Loader)
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### Dependencies
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* [CC65](https://cc65.github.io/cc65/)
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* The crosscompiler suite. Please provide an environment variable *CC65_HOME* pointing to your CC65 folder.
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### How to build
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A makefile is provided. Just run
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```bash
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make
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```
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## Test
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* A correct source image, *testPicture.png*, is provided as an example. Convert it using the application *Picture*, then copy it onto a disk image along with the Apple II loader. You can use or refer to the provided script in the *Loader_Apple2* folder.
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* Another source image, *testTile.png*, is provided to test that the correct tile is converted and extracted using the application *Tile*.
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### Demo
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The live preview can help to visualise color clashing and artifacts. You can edit your file using *Photoshop* or any other application. The *Preview* window will be updated each time the file is saved.
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<a href="https://pub.xtof.info/github/demo-rgb2hires.mp4">
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<img src="https://pub.xtof.info/github/demo-rgb2hires.png"/>
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</a>
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