In most cases the stride is the same as the width. The stride is useful if you are trying to copy/draw a sub-region of a Bitmap. For instance, if you have a 100x100 bitmap and you want to draw the 50x50 top-right corner, you can use a width of 50px and a stride of 100px.
Stride is number of bytes used for storing one image row. Stride can be different from the image width. Most of the images are 4 byte aligned.
For ex. A 24 bit (RGB) image with width of 50 pixels. The total bytes required will be 150 (3(RGB)*50).
As image will be 4 byte aligned, in this case the byte required will become 152. So you will see stride as 152, width 50 and image alignment as 4 byte.
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