cvimwrite

cvimwrite is a function in the OpenCV (Open Source Computer Vision Library) that is used to save an image to a specified file. It is part of the imgcodecs module. The function takes two primary arguments: the filename (including the path and extension) and the image data itself, which is typically a NumPy array representing the image.

The filename argument determines the format in which the image will be saved. OpenCV supports a wide variety of image formats, including PNG, JPEG, BMP, TIFF, and others, based on the file extension provided. For example, providing a ".png" extension will save the image in the PNG format, while a ".jpg" or ".jpeg" will save it as a JPEG image.

The image data argument should be a multi-dimensional NumPy array. For color images, this array usually has three dimensions (height, width, channels), with the channels representing color components like BGR (Blue, Green, Red) by default in OpenCV. For grayscale images, the array is typically two-dimensional (height, width).

cvimwrite can also accept optional parameters that control the compression and quality of the saved image, depending on the file format. For JPEG images, a quality parameter can be specified, ranging from 0 (worst quality, smallest size) to 100 (best quality, largest size). For PNG, compression levels can be adjusted. The function returns a boolean value, indicating whether the image was successfully saved or not.