我有一个透明背景的 .PNG 图像和一个黑色的绘图,我怎么能以编程方式将此图像中的“黑色绘图颜色”更改为我想要的任何颜色;使用 rim 4.5 API?提前致谢 ....
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2408 次
3 回答
2
我找到了解决方案,这里是为那些感兴趣的人准备的。
Bitmap colorImage(Bitmap image, int color) {
int[] rgbData= new int[image.getWidth() * image.getHeight()];
image.getARGB(rgbData,
0,
image.getWidth(),
0,
0,
image.getWidth(),
image.getHeight());
for (int i = 0; i < rgbData.length; i++) {
int alpha = 0xFF000000 & rgbData[i];
if((rgbData[i] & 0x00FFFFFF) == 0x00000000)
rgbData[i]= alpha | color;
}
image.setARGB(rgbData,
0,
image.getWidth(),
0,
0,
image.getWidth(),
image.getHeight());
return image;
}
于 2010-02-14T10:13:48.533 回答
1
您可以解析图像 RGB 以搜索黑色并将其替换为您想要的任何颜色。
于 2010-02-14T10:10:09.493 回答
1
您可以将 PNG 图像读取到字节数组并编辑调色板块。此方法仅适用于 PNG-8 图像。这是我的代码:
public static Image createImage(String filename) throws Throwable
{
DataInputStream dis = null;
InputStream is = null;
try {
is = new Object().getClass().getResourceAsStream(filename);
dis = new DataInputStream(is);
int pngLength = dis.available();
byte[] png = new byte[pngLength];
int offset = 0;
dis.read(png, offset, 4); offset += 4; //‰PNG
dis.read(png, offset, 4); offset += 4; //....
while (true) {
//length
dis.read(png, offset, 4); offset += 4;
int length = (png[offset-1]&0xFF) | ((png[offset-2]&0xFF)<<8) | ((png[offset-3]&0xFF)<<16) | ((png[offset-4]&0xFF)<<24);
//chunk type
dis.read(png, offset, 4); offset += 4;
int type = (png[offset-1]&0xFF) | ((png[offset-2]&0xFF)<<8) | ((png[offset-3]&0xFF)<<16) | ((png[offset-4]&0xFF)<<24);
//chunk data
for (int i=0; i<length; i++) {
dis.read(png, offset, 1); offset += 1;
}
//CRC
dis.read(png, offset, 4); offset += 4;
int crc = (png[offset-1]&0xFF) | ((png[offset-2]&0xFF)<<8) | ((png[offset-3]&0xFF)<<16) | ((png[offset-4]&0xFF)<<24);
if (type == 0x504C5445) { //'PLTE'
int CRCStart = offset-4;
int PLTEStart = offset-4-length;
//modify PLTE chunk
for (int i=PLTEStart; i<PLTEStart+length; i+=3) {
png[i+0] = ...
png[i+1] = ...
png[i+2] = ...
}
int newCRC = crc(png, PLTEStart-4, length+4);
png[CRCStart+0] = (byte)(newCRC>>24);
png[CRCStart+1] = (byte)(newCRC>>16);
png[CRCStart+2] = (byte)(newCRC>>8);
png[CRCStart+3] = (byte)(newCRC);
}
if (offset >= pngLength)
break;
}
return Image.createImage(png, 0, pngLength);
} catch (Throwable e) {
throw e;
} finally {
MainCanvas.closeInputStream(dis);
MainCanvas.closeInputStream(is);
}
}
于 2010-02-15T14:45:28.350 回答