| replace |
(Array table, ...) |
typedict.Image |
| |
Uses
table,
which usually is an array of 256 integers that have values between
0
and
255,
as a lookup table that maps the color components of each pixel
in this image into new values,
and returns this image to the caller.
One argument tells
replace
to use
table
to map all the color components in this image.
Two or more arguments means
replace
only touches the first
argc
color components, where
argc
is the number of arguments in the call.
NULL
tables
are allowed and mean the selected color components will not be changed.
| |
| Example: |
The program,
import yoix.*.*;
Array toss[256];
Array dark[256];
Array keep[256];
for (n = 0; n < 256; n++) {
toss[n] = 0;
keep[n] = n;
dark[n] = n/2;
}
Image img = {
String source = "http://www.yoix.org/imgs/ATTlogo.gif";
Array metrics = {0, 0, 1.0, 1.0};
};
Image img_dark = {
Image source = img;
Array metrics = {0, 0, 1.0, 1.0};
paint() {
replace(dark);
}
};
Image img_blue = {
Image source = img;
Array metrics = {0, 0, 1.0, 1.0};
paint() {
replace(toss, toss, keep);
}
};
JFrame f = {
paint(Rectangle r) {
graphics {
rectclip(r);
moveto(72, 72);
showimage(img);
showimage(img_dark);
showimage(img_blue);
initclip();
}
}
};
f.visible = TRUE;
uses
replace
to darken one image and extract the blue color component in another.
Notice how the
metrics
arrays defined in the images control where showimage, which is defined in
Graphics,
places them.
| | |
| Return: |
Image
| | |
| See Also: |
convert,
convolve,
getpixel,
rescale,
setpixel,
transform
|
|
Yoix is a registered trademark of AT&T Inc.
|
