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docs: encoding indexed color images requires a palette [skip-ci]

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Randy 2022-01-29 19:43:11 +01:00
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@ -56,6 +56,8 @@ Encodes the image from `img` in the source format `fmt` to the specified PNG for
The width, height, color type, bit depth and interlace method must be set with [spng_set_ihdr()](chunk.md#spng_set_ihdr).
If the color type is set to `SPNG_COLOR_TYPE_INDEXED` a palette must be set with [spng_set_plte()](chunk.md#spng_set_plte).
`img` must point to a buffer of length `len`, `len` must be equal to the expected image
size for the given format `fmt`.