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Merge pull request #356 from Daniil-Osokin:bugfix_imread_tutorial

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Andrey Kamaev 2013-01-30 13:05:31 +04:00 committed by OpenCV Buildbot
commit d0350402de
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doc/tutorials/introduction/load_save_image/load_save_image.rst
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@ -15,7 +15,7 @@ In this tutorial you will learn how to:
.. container:: enumeratevisibleitemswithsquare .. container:: enumeratevisibleitemswithsquare
* Load an image using :imread:`imread <>` * Load an image using :imread:`imread <>`
* Transform an image from RGB to Grayscale format by using :cvt_color:`cvtColor <>` * Transform an image from BGR to Grayscale format by using :cvt_color:`cvtColor <>`
* Save your transformed image in a file on disk (using :imwrite:`imwrite <>`) * Save your transformed image in a file on disk (using :imwrite:`imwrite <>`)
Code Code
@ -45,7 +45,7 @@ Here it is:
} }
Mat gray_image; Mat gray_image;
cvtColor( image, gray_image, CV_RGB2GRAY ); cvtColor( image, gray_image, CV_BGR2GRAY );
imwrite( "../../images/Gray_Image.jpg", gray_image ); imwrite( "../../images/Gray_Image.jpg", gray_image );
@ -68,11 +68,11 @@ Explanation
* Creating a Mat object to store the image information * Creating a Mat object to store the image information
* Load an image using :imread:`imread <>`, located in the path given by *imageName*. Fort this example, assume you are loading a RGB image. * Load an image using :imread:`imread <>`, located in the path given by *imageName*. Fort this example, assume you are loading a RGB image.
#. Now we are going to convert our image from RGB to Grayscale format. OpenCV has a really nice function to do this kind of transformations: #. Now we are going to convert our image from BGR to Grayscale format. OpenCV has a really nice function to do this kind of transformations:
.. code-block:: cpp .. code-block:: cpp
cvtColor( image, gray_image, CV_RGB2GRAY ); cvtColor( image, gray_image, CV_BGR2GRAY );
As you can see, :cvt_color:`cvtColor <>` takes as arguments: As you can see, :cvt_color:`cvtColor <>` takes as arguments:
@ -80,7 +80,7 @@ Explanation
* a source image (*image*) * a source image (*image*)
* a destination image (*gray_image*), in which we will save the converted image. * a destination image (*gray_image*), in which we will save the converted image.
* an additional parameter that indicates what kind of transformation will be performed. In this case we use **CV_RGB2GRAY** (self-explanatory). * an additional parameter that indicates what kind of transformation will be performed. In this case we use **CV_BGR2GRAY** (because of :imread:`imread <>` has BGR default channel order in case of color images).
#. So now we have our new *gray_image* and want to save it on disk (otherwise it will get lost after the program ends). To save it, we will use a function analagous to :imread:`imread <>`: :imwrite:`imwrite <>` #. So now we have our new *gray_image* and want to save it on disk (otherwise it will get lost after the program ends). To save it, we will use a function analagous to :imread:`imread <>`: :imwrite:`imwrite <>`