Commands Used with the IMGCTRL, IMGOP and PICFILL Functions |
Scales an image
rc=IMGOP(task-id, 'SCALE', width, height<,
algorithm>);
|
region-id=PICFILL(graphenv-id, type, ulr, ulc,
lrr, lrc, source<, 'SCALE'<, arguments>>);
|
-
width
-
is the new width of the image (in pixels).
Type: Numeric
-
height
-
is the new height of the image (in pixels).
Type:
Numeric
-
algorithm
-
specifies which scaling algorithm to use:
-
BILINEAR
-
computes each new pixel in the final image
by averaging four pixels in the source image and using that value. The BILINEAR
algorithm is more computationally expensive than LINEAR, but it preserves
details in the image better.
-
LINEAR
-
replicates pixels when the image is scaled
up and discards pixels when the image is scaled down. The LINEAR algorithm
yields good results on most images. However, it does not work very well when
you are scaling down an image that contains small, but important, features
such as lines that are only one pixel wide. LINEAR is the default.
Type:
Character
SCALE acts on the currently selected image.
It scales the image to a new image. If you specify -1
for either width or height,
then SCALE preserves the image's aspect ratio.
Double the size of an image:
main:
rc=imgop(task-id,'READ',path);
rc=imgop(task-id,'QUERYN','WIDTH',width);
rc=imgop(task-id,'SCALE',2*width,-1);
rc=imgop(task-id,'PASTE');
return;
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