The captured images from espcam

Projects Programming
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I need some grayscale image as (pgm), Can I get on pgm images from espcam?

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The available formats are defined by the pixformat_t enum in 'sensor.h':

typedef enum {
    PIXFORMAT_RGB565,    // 2BPP/RGB565
    PIXFORMAT_YUV422,    // 2BPP/YUV422
    PIXFORMAT_YUV420,    // 1.5BPP/YUV420
    PIXFORMAT_GRAYSCALE, // 1BPP/GRAYSCALE
    PIXFORMAT_JPEG,      // JPEG/COMPRESSED
    PIXFORMAT_RGB888,    // 3BPP/RGB888
    PIXFORMAT_RAW,       // RAW
    PIXFORMAT_RGB444,    // 3BP2P/RGB444
    PIXFORMAT_RGB555,    // 3BP2P/RGB555
} pixformat_t;
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