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filter(GRAY) on an ALPHA image will do the right thing

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benfry
2007-03-23 20:42:44 +00:00
parent 0ac5aeffde
commit 73fb27c43f
1 changed files with 22 additions and 13 deletions
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core/src/processing/core/PImage.java
+22 -13
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@@ -498,17 +498,26 @@ public class PImage implements PConstants, Cloneable {
break;
case GRAY:
// Converts RGB image data into grayscale using
// weighted RGB components, and keeps alpha channel intact.
// [toxi 040115]
for (int i = 0; i < pixels.length; i++) {
int col = pixels[i];
// luminance = 0.3*red + 0.59*green + 0.11*blue
// 0.30 * 256 = 77
// 0.59 * 256 = 151
// 0.11 * 256 = 28
int lum = (77*(col>>16&0xff) + 151*(col>>8&0xff) + 28*(col&0xff))>>8;
pixels[i] = (col & ALPHA_MASK) | lum<<16 | lum<<8 | lum;
if (format == ALPHA) {
// for an alpha image, convert it to an opaque grayscale
for (int i = 0; i < pixels.length; i++) {
int col = 255 - pixels[i];
pixels[i] = 0xff000000 | (col << 16) | (col << 8) | col;
}
} else {
// Converts RGB image data into grayscale using
// weighted RGB components, and keeps alpha channel intact.
// [toxi 040115]
for (int i = 0; i < pixels.length; i++) {
int col = pixels[i];
// luminance = 0.3*red + 0.59*green + 0.11*blue
// 0.30 * 256 = 77
// 0.59 * 256 = 151
// 0.11 * 256 = 28
int lum = (77*(col>>16&0xff) + 151*(col>>8&0xff) + 28*(col&0xff))>>8;
pixels[i] = (col & ALPHA_MASK) | lum<<16 | lum<<8 | lum;
}
}
break;
@@ -521,7 +530,7 @@ public class PImage implements PConstants, Cloneable {
case POSTERIZE:
throw new RuntimeException("Use filter(POSTERIZE, int levels) " +
"instead of filter(POSTERIZE)");
"instead of filter(POSTERIZE)");
case RGB:
for (int i = 0; i < pixels.length; i++) {
@@ -534,7 +543,7 @@ public class PImage implements PConstants, Cloneable {
filter(THRESHOLD, 0.5f);
break;
// [toxi20050728] added new filters
// [toxi20050728] added new filters
case ERODE:
dilate(true);
break;