我在安卓中有关于LUT的问题。
我的问题是,我有4X4的LUTs,在安卓中使用这些LUTs为位图图像应用滤镜效果。以下是我的示例LUT文件链接。 Lut link sample
在安卓中是否可行?如果可行,请帮我解决如何应用的问题。
提前致谢。
我在安卓中有关于LUT的问题。
我的问题是,我有4X4的LUTs,在安卓中使用这些LUTs为位图图像应用滤镜效果。以下是我的示例LUT文件链接。 Lut link sample
在安卓中是否可行?如果可行,请帮我解决如何应用的问题。
提前致谢。
getLutIndex()
处)的顺序。
请检查我的编辑答案:final static int X_DEPTH = 16;
final static int Y_DEPTH = 16; //One little square has 16x16 pixels in it
final static int ROW_DEPTH = 4;
final static int COLUMN_DEPTH = 4; // the image consists of 4x4 little squares
final static int COLOR_DISTORTION = 16; // 256*256*256 => 256 no distortion, 64*64*64 => 256 dividied by 4 = 64, 16x16x16 => 256 dividied by 16 = 16
private Bitmap applyLutToBitmap(Bitmap src, Bitmap lutBitmap) {
int lutWidth = lutBitmap.getWidth();
int lutColors[] = new int[lutWidth * lutBitmap.getHeight()];
lutBitmap.getPixels(lutColors, 0, lutWidth, 0, 0, lutWidth, lutBitmap.getHeight());
int mWidth = src.getWidth();
int mHeight = src.getHeight();
int[] pix = new int[mWidth * mHeight];
src.getPixels(pix, 0, mWidth, 0, 0, mWidth, mHeight);
int R, G, B;
for (int y = 0; y < mHeight; y++)
for (int x = 0; x < mWidth; x++) {
int index = y * mWidth + x;
int r = ((pix[index] >> 16) & 0xff) / COLOR_DISTORTION;
int g = ((pix[index] >> 8) & 0xff) / COLOR_DISTORTION;
int b = (pix[index] & 0xff) / COLOR_DISTORTION;
int lutIndex = getLutIndex(lutWidth, r, g, b);
R = ((lutColors[lutIndex] >> 16) & 0xff);
G = ((lutColors[lutIndex] >> 8) & 0xff);
B = ((lutColors[lutIndex]) & 0xff);
pix[index] = 0xff000000 | (R << 16) | (G << 8) | B;
}
Bitmap filteredBitmap = Bitmap.createBitmap(mWidth, mHeight, src.getConfig());
filteredBitmap.setPixels(pix, 0, mWidth, 0, 0, mWidth, mHeight);
return filteredBitmap;
}
//the magic happens here
private int getLutIndex(int lutWidth, int redDepth, int greenDepth, int blueDepth) {
int lutX = (greenDepth % ROW_DEPTH) * X_DEPTH + blueDepth;
int lutY = (greenDepth / COLUMN_DEPTH) * Y_DEPTH + redDepth;
return lutY * lutWidth + lutX;
}
您可以参考以下步骤,希望能帮您找到正确的流程。
这里的主要位图是照片。
mLut3D是存储在drawable中的LUT图像数组。
RenderScript mRs;
Bitmap mLutBitmap, mBitmap;
ScriptIntrinsic3DLUT mScriptlut;
Bitmap mOutputBitmap;
Allocation mAllocIn;
Allocation mAllocOut;
Allocation mAllocCube;
int mFilter = 0;
mRs = RenderScript.create(yourActivity.this);
public Bitmap filterapply() {
int redDim, greenDim, blueDim;
int w, h;
int[] lut;
if (mScriptlut == null) {
mScriptlut = ScriptIntrinsic3DLUT.create(mRs, Element.U8_4(mRs));
}
if (mBitmap == null) {
mBitmap = photo;
}
mOutputBitmap = Bitmap.createBitmap(mBitmap.getWidth(),
mBitmap.getHeight(), mBitmap.getConfig());
mAllocIn = Allocation.createFromBitmap(mRs, mBitmap);
mAllocOut = Allocation.createFromBitmap(mRs, mOutputBitmap);
// }
mLutBitmap = BitmapFactory.decodeResource(getResources(),
mLut3D[mFilter]);
w = mLutBitmap.getWidth();
h = mLutBitmap.getHeight();
redDim = w / h;
greenDim = redDim;
blueDim = redDim;
int[] pixels = new int[w * h];
lut = new int[w * h];
mLutBitmap.getPixels(pixels, 0, w, 0, 0, w, h);
int i = 0;
for (int r = 0; r < redDim; r++) {
for (int g = 0; g < greenDim; g++) {
int p = r + g * w;
for (int b = 0; b < blueDim; b++) {
lut[i++] = pixels[p + b * h];
}
}
}
Type.Builder tb = new Type.Builder(mRs, Element.U8_4(mRs));
tb.setX(redDim).setY(greenDim).setZ(blueDim);
Type t = tb.create();
mAllocCube = Allocation.createTyped(mRs, t);
mAllocCube.copyFromUnchecked(lut);
mScriptlut.setLUT(mAllocCube);
mScriptlut.forEach(mAllocIn, mAllocOut);
mAllocOut.copyTo(mOutputBitmap);
return mOutputBitmap;
}
通过增加mFilter的值,可以在不同的LUT图像中获得不同的滤镜效果,请查看。
您可以通过访问Github上的该链接了解更多帮助信息,我是从这里获取答案的: https://github.com/RenderScript/RsLutDemo
希望这能够有所帮助。
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsic3DLUT;
import android.renderscript.Type;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
ImageView imageView1;
RenderScript mRs;
Bitmap mBitmap;
Bitmap mLutBitmap;
ScriptIntrinsic3DLUT mScriptlut;
Bitmap mOutputBitmap;
Allocation mAllocIn;
Allocation mAllocOut;
Allocation mAllocCube;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView1 = (ImageView) findViewById(R.id.imageView);
mRs = RenderScript.create(this);
Background background = new Background();
background.execute();
}
class Background extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
if (mRs == null) {
mRs = RenderScript.create(MainActivity.this);
}
if (mBitmap == null) {
mBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.bugs);
mOutputBitmap = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), mBitmap.getConfig());
mAllocIn = Allocation.createFromBitmap(mRs, mBitmap);
mAllocOut = Allocation.createFromBitmap(mRs, mOutputBitmap);
}
if (mLutBitmap == null) {
mLutBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.dawizfe);
int w = mLutBitmap.getWidth();
int h = mLutBitmap.getHeight();
int redDim = w / 4;
int greenDim = h / 4;
int blueDim = 16;
android.renderscript.Type.Builder tb = new Type.Builder(mRs, Element.U8_4(mRs));
tb.setX(redDim);
tb.setY(greenDim);
tb.setZ(blueDim);
Type t = tb.create();
mAllocCube = Allocation.createTyped(mRs, t);
int[] pixels = new int[w * h];
int[] lut = new int[w * h];
mLutBitmap.getPixels(pixels, 0, w, 0, 0, w, h);
int i = 0;
for (int r = 0; r < redDim; r++) {
for (int g = 0; g < greenDim; g++) {
for (int b = 0; b < blueDim; b++) {
int gdown = g / 4;
int gright = g % 4;
lut[i] = pixels[b + r * w + gdown * w * redDim + gright * blueDim];
i++;
}
}
}
// This is an identity 3D LUT
// i = 0;
// for (int r = 0; r < redDim; r++) {
// for (int g = 0; g < greenDim; g++) {
// for (int b = 0; b < blueDim; b++) {
// int bcol = (b * 255) / blueDim;
// int gcol = (g * 255) / greenDim;
// int rcol = (r * 255) / redDim;
// lut[i] = bcol | (gcol << 8) | (rcol << 16);
// i++;
// }
// }
// }
mAllocCube.copyFromUnchecked(lut);
}
if (mScriptlut == null) {
mScriptlut = ScriptIntrinsic3DLUT.create(mRs, Element.U8_4(mRs));
}
mScriptlut.setLUT(mAllocCube);
mScriptlut.forEach(mAllocIn, mAllocOut);
mAllocOut.copyTo(mOutputBitmap);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
imageView1.setImageBitmap(mOutputBitmap);
}
}
}