How to insert image data of type CV:: Mat

[ZRBzrb6119]

The byte data of type CV:: Mat seems to fail the image type verification if (memcmp(&signature[1], "PNG", 3) == 0) { if (_process_png(image_props) != LXW_NO_ERROR) return LXW_ERROR_IMAGE_DIMENSIONS; } else if (signature[0] == 0xFF && signature[1] == 0xD8) { if (_process_jpeg(image_props) != LXW_NO_ERROR) return LXW_ERROR_IMAGE_DIMENSIONS; } else if (memcmp(signature, "BM", 2) == 0) { if (_process_bmp(image_props) != LXW_NO_ERROR) return LXW_ERROR_IMAGE_DIMENSIONS; } else if (memcmp(signature, "GIF8", 4) == 0) { if (_process_gif(image_props) != LXW_NO_ERROR) return LXW_ERROR_IMAGE_DIMENSIONS; } else { LXW_WARN_FORMAT1("worksheet image insertion: " "unsupported image format for: %s.", image_props->filename); return LXW_ERROR_IMAGE_DIMENSIONS; }

[jmcnamara]

Some questions:

• Is the image type in the buffer actually supported by libxlsxwriter/Excel?
• If so what happens if you dump the image to a file and then create a simple hello world program that inserts the image from the file (not buffer)?
• Could you attach a sample image that is failing?

[jmcnamara]

Closing due to lack of feedback. I will reopen with a working example or if the questions above are answered.