In OpenCV you can easily read in images with different file formats (JPG, PNG, TIFF etc.) using? imread . The basic usage is shown below
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The?
flags
?option is used to control how the image is read. Let’s look at some common examples. In all the examples below, make sure you use the right namespace for C++ and import OpenCV for Python.
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Read as 8-bit / channel Color Image ( without Alpha Channel)
A vast majority of images are 8-bit per channel ( or 24-bit ) images. They can be read using default flags.
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Read as 8-bit Grayscale Image
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Read 16-bit / channel Color Image
Most digital SLR cameras are capable of recording images at a higher bit depth than 8-bits / channel. The raw images from these cameras can be converted to 16-bit / channel PNG or TIFF images. These 16-bit / channel images can be read using
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You may also use the flag IMREAD_UNCHANGED instead. See an example below.
Read a Transparent PNG or TIFF in OpenCV
A transparent image has four channels — 3 for color, and one for transparency. These images can be read in OpenCV using the IMREAD_UNCHANGED flag.
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NOTE :? CV_LOAD_IMAGE_COLOR, CV_LOAD_IMAGE_GRAYSCALE, CV_LOAD_IMAGE_ANYCOLOR, CV_LOAD_IMAGE_ANYDEPTH, and CV_LOAD_IMAGE_UNCHANGED will be removed in future versions of OpenCV.
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