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+# HD Graphics
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+
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+It's possible to provide alternative HD-Graphics within mods. They will be used if any upscaling filter is activated.
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+
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+## Preconditions
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+
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+It's still necessary to add 1x graphics as before. HD graphics are seperate from usual graphics. This allows to partitially use HD for a few graphics in mod. And avoid handling huge graphics if upscaling isn't enabled.
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+
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+Currently following scaling factors are possible to use: 2x, 3x, 4x. You can also provide multiple of them (increases size of mod, but improves loading performance for player). It's recommend to provide 2x and 3x images.
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+
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+If user for example selects 3x resolution and only 2x exists in mod then the 2x images are upscaled to 3x (same for other combinations > 1x).
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+
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+## Mod
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+
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+For upscaled images you have to use following folders (next to `sprites` and `data` folders):
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+- `sprites2x`, `sprites3x`, `sprites4x` for sprites
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+- `data2x`, `data3x`, `data4x` for images
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+
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+The sprites should have the same name and folder structure as in `sprites` and `data` folder. All images that are missing in the upscaled folders are scaled with the selected upscaling filter instead of using prescaled images.
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+
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+### Shadows / Overlays
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+
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+It's also possible (but not necessary) to add HD shadows: Just place a image next to the normal upscaled image with the suffix `-shadow`. E.g. `TestImage.png` and `TestImage-shadow.png`.
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+
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+Same for overlays with `-overlay`. But overlays are **necessary** for some animation graphics. They will be colorized by VCMI.
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+
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+Currently needed for:
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+- flaggable adventure map objects (needs a transparent image with white flags on it)
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+- creature battle animations (needs a transparent image with white outline of creature for highlighting on mouse hover)
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Laserlicht