CI uses the imageMogr2 API to adjust an image’s contrast, which is the difference in luminance between the brightest and darkest points in an image (i.e., the contrast in grayscale).
|download_url||URL of the input image, formatted as
|/contrast/&dxlt;value>||Adjusts the contrast of an image. The value must be an integer in the range of [−100, 100].
|/ignore-error/1||If this parameter is carried and the image failed to be processed because it is too large, the input image will be returned with no error reported.|
This example reduces the contrast of an image by 50:
This example processes the image in the same way as in the example above except that a signature is added. The signature is joined with other processing parameters using an ampersand (&):
You can obtain the value of
<signature>by referring to Request Signature.