users.setPhoto method
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Usage info
This method allows the user to set their profile image. The caller can pass image data via image.
Providing a "crop box" with crop_x, crop_y, and crop_w is optional. Otherwise, the whole image will be used. If cropping instructions are not specified and the source image is not square, the image will be letterboxed, just like your favorite old laserdiscs.
Please limit your images to a maximum size of 1024 by 1024 pixels. 512x512 pixels is the minimum.
To remove a profile image, use the companion method users.deletePhoto.
Use this method with a HTTP POST and provide your HTTP Content-type as multipart/form-data.
When providing the image parameter, provide your image data directly but present its correct Content-type, such as image/gif, image/jpeg, image/png, etc.