Resampling to a Higher Resolution and Size
.
When an image is resampled to increase either its dimensions or number of pixels per inch (higher resolution), Painter adds pixels (unless the File Size Constrained box is checked), making its best guess as to what colors those new pixels will need to be in order to maintain smooth color transitions. If the image, for instance, were resampled to double its dimensions (1 inch square up to 2 inch square with four 1 inch squares inside it) and Painter simply multiplied each colored pixel by four of the same color, each group of four pixels would appear to be one large pixel and the image would look crude and pixelated like the zoomed in screen prints you see below. In other words, the multiplied same color pixels grouped together would not produce smooth graduated color transitions. Click here to jump to the final resampled and enlarged image, shown with a screen print of a 30 pixel square in its upper left corner, at the bottom of this page. 
(It's best to work at a higher resolution to begin with
than to lose visual quality by relying on resampling to a larger size after the fact.)

Above
Original Image:
1.08 x 1.08 inches
(162 x 162 pixels)
Resolution 150 ppi
(total 26,244 pixels)
File Size: 21 kb

Left
Original Image:
Screen print of 30 pixel square
in upper left corner of image.
Zoomed to 1441%

Above
Resampled Image 1:
Now .54 x .54 inches
(162 x 162 pixels)
Resolution 300 ppi
File Size Constrained (total 26,244 pixels)
File Size: 20 kb

Left
Resampled Image 1:
Screen print of 30 pixel square
in upper left corner of image.
Zoomed to 1441% 

Above
Resampled Image 2:
Screen print of 30 pixel square
in upper left corner of image.
Zoomed to 1441%

Above
Resampled Image 2:
1.08 x 1.08 inches
(324 x 324 pixels) Resolution 300 ppi
File Size Not Constrained
(total 104,976 pixels) 
File Size: 46 kb

 

The image and screen print of a 30 pixel square in its upper left corner shown below are the result of first increasing the original image's resolution from 150 ppi to 300 ppi, then increasing that resampled image's dimensions from 1.08 x 1.08 inches to 2.16 x 2.16 inches.
Above
Resampled Image 3:
Screen print of 30 pixel square
in upper left corner of image
Zoomed to 1441% 
Above
Resampled Image 3 (from Resampled Image 2):
2.16 x 2.16 inches
(648 x 648 pixels) Resolution 300 ppi
File Size Not Constrained
(total of 419,904 pixels)
File Size: 128 kb
Jinny Brown, October 7, 2001

©1994 - 2001, Jinny Brown
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