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Types of Resampling

How does PSP choose which pixels to add or remove in resampling? It depends upon the type of resampling you select in the Resize dialoge box. Below are descriptions of the different types of resampling you can use when resizing an image. These descriptions were found in Paint Shop Pro Help listed under Resizing Images.

Smart Size Use this type in most cases. Based on the new pixel dimensions you set, Paint Shop Pro chooses the best algorithm listed below.

Weighted Average Uses a weighted-average color value of neigh­boring pixels to determine how newly created pixels will appear. Use this type when reducing photo-realistic, irregular, or complex images.

Bilinear Uses the two nearest pixels around each existing pixel to determine how newly created pixels will appear.

Bicubic Minimizes the jaggedness that often results from expand­ing an image by estimating how the newly created pixels will appear. Use this type when enlarging photo-realistic, irregular, or complex images.

Pixel Resize Duplicates or removes pixels as necessary to achieve the selected width and height of the image. Use this type with hard-edged images and simple graphics.

Note: Bilinear, bicubic, and weighted average resampling are available only for greyscale and 16 million color images.