Resampling mode. Selects the resampling and/or interpolation algorithm to be used for scaling the rendered image to the size specified with wid=, hei=, or scl=.
Selects standard bilinear interpolation. Fastest resampling method; some aliasing artifacts may be noticeable.
Selects bicubic interpolation. More CPU-intensive than bilinear interpolation, but will yield sharper images with less noticeable aliasing artifacts.
Selects a modified Lanczos Window function as an interpolation algorithm. May produce slightly sharper results than bicubic at a higher CPU cost.
sharp has been replaced by sharp2 , which has a lesser likelihood of causing aliasing artifacts, also known as Moiré.
Selects the Adobe Photoshop default resampler for reducing image size which is called "bicubic sharper" in Adobe Photoshop .
May occur anywhere within the request. Ignored if no final image scaling is applied.