◆ imwrite() opencv cv2
bool cv::imwrite(const String & filename,
InputArray img,
const std::vector< int > & params = std::vector< int >()
)
Python:
retval=cv.imwrite(filename, img[, params])
Saves an image to a specified file.The function imwrite saves the image to the specified file. The image format is chosen based on the filename extension (see cv::imread for the list of extensions). In general, only 8-bit single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function, with these exceptions:
[*]16-bit unsigned (CV_16U) images can be saved in the case of PNG, JPEG 2000, and TIFF formats
[*]32-bit float (CV_32F) images can be saved in TIFF, OpenEXR, and Radiance HDR formats; 3-channel (CV_32FC3) TIFF images will be saved using the LogLuv high dynamic range encoding (4 bytes per pixel)
[*]PNG images with an alpha channel can be saved using this function. To do this, create 8-bit (or 16-bit) 4-channel image BGRA, where the alpha channel goes last. Fully transparent pixels should have alpha set to 0, fully opaque pixels should have alpha set to 255/65535 (see the code sample below).
[*]Multiple images (vector of Mat) can be saved in TIFF format (see the code sample below).
If the format, depth or channel order is different, use Mat::convertTo and cv::cvtColor to convert it before saving. Or, use the universal FileStorage I/O functions to save the image to XML or YAML format.
https://docs.opencv.org/3.4/d4/da8/group__imgcodecs.html#gabbc7ef1aa2edfaa87772f1202d67e0ce
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