Add configurable default chroma subsampling mode for JPEG encoder #819
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This introduces a new `chroma_t` enum and the function `jpgSetChroma()` to select the default chroma subsampling (4:4:4, 4:2:2, 4:2:0) used by the JPEG encoder. This avoids changing existing function signatures and allows globally configurable encoder behavior. The previous default (H2V2 / 4:2:0) remains unchanged unless overridden.
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Description
This PR adds support for configuring the default chroma subsampling mode used by the JPEG encoder.
Up until now, the encoder has always used H2V2 (4:2:0) subsampling internally.
For projects that benefit from higher chroma detail (e.g., thermal imaging, graphics, UI elements), it is useful to be able to select 4:2:2 or 4:4:4 instead.
What’s Added
chroma_tenum defining available chroma subsampling modes:jpgSetChroma(chroma_t chroma)to set the global default encoder mode.The encoder now uses
default_subsamplinginstead of a hardcoded subsampling value.The existing default behavior (H2V2 / CHROMA_420) remains unchanged unless the user calls
jpgSetChroma().Example Usage
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