After scanning or importing an image, you can adjust its size using Image > Resize.
Pixels have no set, physical size. Each pixel just represents one area of a single color. Resizing can reduce or increase the number of pixels in the image (resampling the image). This reduces or increases the file size.
Resolution is the number of pixels printed per inch. More pixels per inch (ppi), will create smaller printed pixels and a smaller printed image. Fewer ppi, will create larger printed pixels and a larger printed image. Resizing can also change the image’s resolution, leaving the number of pixels in an image (and the file size) unchanged.
For best results:
Don’t increase an image’s size more than 25 percent. Increasing the size of an image causes a loss of detail and sharpness.
Only resize an image once. If your first resize is not correct, undo it and try again.
Correct and retouch images before resizing.
To increase or decrease the pixels in an image:
Choose Image > Resize (Shift + S) to open the Resize dialog.
To resize the current layer only, clear the Resize all Layers check box.
Mark the Resample using check box and select a resampling type:
Note: Bilinear, bicubic, and weighted average resampling are available only for greyscale and 16 million color 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.
To constrain the new image dimensions to the image’s current proportions, mark the Lock Aspect Ratio check box. The aspect (width-to-height) ratio defaults to the ratio of the active image. Changing the aspect ratio distorts the image by stretching or contracting it in one dimension more than the other.
To keep the image’s current print size, mark the Maintain original print size check box. The image resolution will change, keeping the print size constant. For information on selecting image resolution, see About Image Size, Resolution, and Color Depth.
In the Pixel Dimensions group box, enter the new Width and Height values. From the drop-down list, choose whether to enter values in pixels or as a percent of the original size.
Click OK.
To change the resolution (print size) of an image:
Choose Image > Resize (Shift + S) to open the Resize dialog.
Clear the Resample using check box.
In the Print Size group box, enter the new Width and Height values or the new Resolution value. Choose measurement systems from the drop-lists to the right. For information on selecting image resolution, see About Image Size, Resolution, and Color Depth.
Click OK.