Accusoft ImagXpress 13
IX_PngFilter Enumeration
Description
The filters available for PNG compression.
Members
MemberValueDescription
IX_PngFilter_Average3The Average filter uses the average of the two neighboring pixels (left and above) to predict the value of a pixel.
IX_PngFilter_None0Fastest, no filter is used.
IX_PngFilter_Optimal5Optimal compressed file size, at the expense of speed.
IX_PngFilter_Paeth4The Paeth filter computes a simple linear function of the three neighboring pixels (left, above, upper left), then chooses as predictor the neighboring pixel closest to the computed value. This technique is due to Alan W. Paeth.
IX_PngFilter_Sub1The Sub filter transmits the difference between each byte and the value of the corresponding byte of the prior pixel.
IX_PngFilter_Up2The Up filter is just like the Sub filter except that the pixel immediately above the current pixel, rather than just to its left, is used as the predictor.

 

 


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