from init.py：
opencv版本4.1.0，不同版本也許doc稍有不同

def imwrite(filename, img, params=None): # real signature unknown; restored from __doc__"""imwrite(filename, img[, params]) -> retval. @brief Saves an image to a specified file. 將圖像保存到指定文件. . 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:· imwrite函數將圖像保存到指定文件。 圖像格式是根據文件擴展名選擇的（擴展名列表請參見cv :: imread）。 · 通常，使用此功能只能保存8位單通道或3通道（具有“ BGR”通道順序）圖像，但以下情況除外：. - 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 PFM, TIFF, OpenEXR, and Radiance HDR formats;· 對于PNG，JPEG 2000和TIFF格式，可以保存16位無符號（CV_16U）圖像；· 可以PFM，TIFF，OpenEXR和Radiance HDR格式保存32位浮點（CV_32F）圖像；. 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).· 使用LogLuv高動態范圍編碼（每像素4個字節）將保存3通道（CV_32FC3）TIFF圖像-使用此功能可以保存具有alpha通道的PNG圖像。 · 為此，創建8位（或16位）4通道圖像BGRA，其中alpha通道位于最后。 · 完全透明的像素應將alpha設置為0，完全不透明的像素應將alpha設置為255/65535（請參見下面的代碼示例）。. . 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.· · 如果格式，深度或通道順序不同，請在保存之前使用Mat :: convertTo和cv :: cvtColor進行轉換。 · 或者，使用通用的FileStorage I / O功能將圖像保存為XML或YAML格式。. . The sample below shows how to create a BGRA image and save it to a PNG file. It also demonstrates how to set custom. compression parameters:· 下面的示例演示如何創建BGRA圖像并將其保存到PNG文件。 它還演示了如何設置自定義壓縮參數：. @include snippets/imgcodecs_imwrite.cpp. @param filename Name of the file. 文件名。. @param img Image to be saved. 要保存的圖像。. @param params Format-specific parameters encoded as pairs (paramId_1, paramValue_1, paramId_2, paramValue_2, ... .) see cv::ImwriteFlags特定格式的參數編碼為對（paramId_1，paramValue_1，paramId_2，paramValue_2等）。請參見cv :: ImwriteFlags"""pass

Doc中所指cv :: ImwriteFlags：鏈接

參考文章：OpenCV筆記1：用imwrite函數來保存圖片

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