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Merge remote-tracking branch 'origin/2.4' into merge-2.4

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Roman Donchenko
2014-04-28 12:08:21 +04:00
parent 32b25de583 5042ab1f32
commit 47d903d968
4 changed files with 141 additions and 22 deletions
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modules/highgui/doc/reading_and_writing_images_and_video.rst
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@@ -140,7 +140,7 @@ 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
:ocv:func:`imread` for the list of extensions). Only 8-bit (or 16-bit unsigned (``CV_16U``) in case of PNG, JPEG 2000, and TIFF) single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function. If the format, depth or channel order is different, use
:ocv:func:`Mat::convertTo` , and
:ocv:func:`cvtColor` to convert it before saving. Or, use the universal XML I/O functions to save the image to XML or YAML format.
:ocv:func:`cvtColor` to convert it before saving. Or, use the universal :ocv:class:`FileStorage` I/O functions to save the image to XML or YAML format.
It is possible to store PNG images with an alpha channel 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. The sample below shows how to create such a BGRA image and store to PNG file. It also demonstrates how to set custom compression parameters ::