[英]Processing alpha blending in Java
I'm working on processing and I'd like to recreate on low level code the function blend lightest. 我正在处理,我想在低级代码上重新创建功能最轻的混合。
I saw in documentation that C = max(A * factor, B)
我在文档中看到
C = max(A * factor, B)
C
is the returned color C
是返回的颜色 A
is the source A
是来源 B
is the image to mix with B
是要混合的图像 I've seen on web that the factor specified is based on the alpha component of the source pixel, which is represented by the first 8 bits ( from the left ) of the 32-bit integer representing the pixel color. 我在网上看到,指定的系数基于源像素的alpha分量,该分量由代表像素颜色的32位整数的前8位(从左开始)表示。 These leftmost bits are also referred to as the highest bits.
这些最左边的位也称为最高位。
Source: this book , page 464 资料来源: 这本书 ,第464页
What should i think of it? 我应该怎么看?
This is my code of that part: 这是我那部分的代码:
for (int y = 0; y < capWidth * capHeight; y++) {
int factor = (pixels[y] >> 24) & 0xFF;
pixels[y] = max(pixels[y] * factor, previousFrame.pixels[y]);
}
That doesn't work, any help? 那行不通,有帮助吗?
factor
in your original formula is a floating-point number between 0 and 1, and the factor
in your code is an integer from 0 to 255. factor
是0到1之间的浮点数,而代码中的factor
是0到255之间的整数。 For each color: C = A(a/255) + B(1-(a/255)), where: 对于每种颜色:C = A(a / 255)+ B(1-(a / 255)),其中:
A is the foreground value, A是前景值,
B is the background value, B是背景值,
C is the resultant value, and C是结果值,并且
a is the alpha component. a是alpha分量。
This is per the alpha blending wiki page: http://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending 这是根据Alpha混合Wiki页面进行的: http : //en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
http://processing.googlecode.com/svn/trunk/processing/build/javadoc/core/index.html http://processing.googlecode.com/svn/trunk/processing/build/javadoc/core/index.html
I got it in here, the SVG processing javadoc for blending Lighten ! 我在这里得到了,SVG处理javadoc来混合Lighten! Well !
好 !
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