好了,我已經試過作爲下同航代碼這個簡單的過濾器:爲什麼Pixel Bender過濾器在Toolkit中的表現與Flex/Air應用中的表現不同?
<languageVersion : 1.0;>
kernel NewFilter
< namespace : "Your Namespace";
vendor : "Your Vendor";
version : 1;
description : "your description";
>
{
input image4 src;
output pixel4 dst;
void
evaluatePixel()
{
pixel4 cPix = sampleNearest(src,outCoord());
pixel3 RGB = cPix .rgb;
float r = RGB.r;
float g = RGB.g;
float b = RGB.b;
//float minVal = min(r, g);
dst = pixel4(r, g, b, 1);
}
}
事實證明,如果我取消這條線float minVal = min(r, g);
,我沒有得到原始圖片更多,但這: Result
取而代之的是: Original
如果有人可以解釋這樣對我......我會非常感激......
//------------------------------------------------------------------
//------------------- ORIGINAL POST --------------------------------
我正在嘗試爲flex應用製作像素彎曲濾鏡,它將輸入圖像的色調值的選定範圍更改爲定義的新色調值。 我在Pixel bender Toolkit中製作了這樣的濾鏡,並且它給出了令人滿意的結果。
這是該過濾器的代碼:
<languageVersion : 1.0;>
kernel ColorChange
< namespace : "Your Namespace";
vendor : "Your Vendor";
version : 1;
description : "your description";
>
{
input image4 src;
output pixel4 dst;
parameter float HUE
<
minValue: 0.;
maxValue: 359.9;
defaultValue: 0.;
>;
parameter float SAT
<
minValue: -1.;
maxValue: 1.;
defaultValue: 0.;
>;
parameter float VAL
<
minValue: -1.;
maxValue: 1.;
defaultValue: 0.;
>;
parameter float MIN_RANGE
<
minValue: 0.;
maxValue: 360.;
defaultValue: 0.;
>;
parameter float MAX_RANGE
<
minValue: 0.;
maxValue: 360.;
defaultValue: 360.;
>;
void
evaluatePixel()
{
pixel4 cPix = sample(src,outCoord());
pixel3 RGB = cPix.rgb;
float3 HSV;
//--------------------------------------------------------------
// CONVERT RGB TO HSV
//--------------------------------------------------------------
pixel1 r = RGB.r;
pixel1 g = RGB.g;
pixel1 b = RGB.b;
pixel1 minVal = min(min(r, g), b);
pixel1 maxVal = max(max(r, g), b);
pixel1 delta = maxVal - minVal;
HSV[2] = maxVal;
if (maxVal == 0.) {
HSV[0] = 0.;
HSV[1] = 0.;
}
else
{
HSV[1] = delta/maxVal;
}
if(r == maxVal)
HSV[0] = (g-b)/delta;
else if(g == maxVal)
HSV[0] = 2. + (b-r)/delta;
else
HSV[0] = 4. + (r-g)/delta;
HSV[0] *= 60.;
if(HSV[0] <0.)
HSV[0] += 360.;
//--------------------------------------------------------------
// FILTER RANGE OF HUE
//--------------------------------------------------------------
if((HSV[0] < MIN_RANGE) || (HSV[0] > MAX_RANGE))
{
dst = cPix;
}
else
{
//--------------------------------------------------------------
// CHNAGE HSV
//--------------------------------------------------------------
float hH = HUE;
float sS = SAT;
float vV = VAL;
HSV[0] = HUE;
HSV[1] += SAT;
if(HSV[1] > 1.)
HSV[1] = 1.;
else if(HSV[1] < 0.)
HSV[1] = 0.;
HSV[2] += VAL;
if(HSV[2] > 1.)
HSV[2] = 1.;
else if(HSV[2] < 0.)
HSV[2] = 0.;
//----------------------------------------------------------------------
// CONVERT HSV TO RGB
//----------------------------------------------------------------------
float h = HSV[0];///360.;
float s = HSV[1];///100. * 255.;
float v = HSV[2];///100. * 255.;
if (s == 0.) {
RGB.r = v;
RGB.g = v;
RGB.b = v;
} else {
h = h/60.;
int var_i = int(floor(h));
float f = h - float(var_i);
float p = v * (1.-s);
float q = v * (1.-s*f);
float t = v * (1.-s*(1.-f));
if (var_i == 0) {
RGB.r = v;
RGB.g = t;
RGB.b = p;
}
else if (var_i == 1) {
RGB.r = q;
RGB.g = v;
RGB.b = p;
}
else if (var_i == 2) {
RGB.r = p;
RGB.g = v;
RGB.b = t;
}
else if (var_i == 3) {
RGB.r = p;
RGB.g = q;
RGB.b = v;
}
else if (var_i == 4) {
RGB.r = t;
RGB.g = p;
RGB.b = v;
}
else {
RGB.r = v;
RGB.g = p;
RGB.b = q;
}
}
dst = pixel4(RGB.r, RGB.g, RGB.b, 1);
}
}
}
所以,原理很簡單,轉換每個像素到HSV色彩空間,檢查是否色調落在選定的範圍之間,如果它不改變它的色調來定義一個並轉換回RGB。
問題是,當在Air應用程序中使用時,我得不到相同的結果,從僅使用過濾器的默認參數的角度開始。
這是AIR應用程序的代碼:
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
width="1400" height="800" backgroundAlpha="0.0" xmlns:mx="library://ns.adobe.com/flex/mx"
creationComplete="windowedapplication1_creationCompleteHandler(event)">
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.events.ColorPickerEvent;
import mx.events.FlexEvent;
import spark.filters.ShaderFilter;
import spark.utils.BitmapUtil;
[Embed(source="myFilter.pbj", mimeType="application/octet-stream")]
private var MyBender:Class;
private var shader:Shader = new Shader();
private var shaderJob:ShaderJob;
private var shaderResult:BitmapData;
private function filter():void
{
// Configure desired input parameters of shader.
shader.data.src.input = originalImage.bitmapData;
// shader.data.HUE.value = [H_slider.value];
// shader.data.SAT.value = [S_slider.value];
// shader.data.VAL.value = [V_slider.value];
// shader.data.MAX_RANGE.value = [H_max_slider.value];
// shader.data.MIN_RANGE.value = [H_min_slider.value];
shaderJob = new ShaderJob(shader, shaderResult);
shaderJob.start(true);
bendedImage.source = new Bitmap(shaderResult);
}
private function windowedapplication1_creationCompleteHandler(event:FlexEvent):void
{
// Create new shader instance and initialize with embedded byte code.
shader = new Shader(new MyBender());
shaderResult = new BitmapData(originalImage.width, originalImage.height);
filter();
}
]]>
</fx:Script>
<s:HGroup width="100%">
<s:Group id="originalGroup" width="100%">
<s:Image id="originalImage" source="mandelbrot.png"/>
</s:Group>
<s:Group id="bendedGroup" width="100%">
<s:SWFLoader id="bendedImage" source="mandelbrot.png" />
<s:HSlider id="H_slider" minimum="0" maximum="359.9" stepSize="0.1" value="0" change="filter()" width="500" toolTip="HUE"/>
<s:HSlider id="S_slider" minimum="-1" maximum="1" stepSize="0.1" value="0" y="20" change="filter()" width="500" toolTip="SAT"/>
<s:HSlider id="V_slider" minimum="-1" maximum="1" stepSize="0.1" value="0" y="40" change="filter()" width="500" toolTip="VAL"/>
<s:HSlider id="H_max_slider" minimum="0" maximum="360" stepSize="0.1" value="360" y="60" change="filter()" width="500" toolTip="HUE MAX"/>
<s:HSlider id="H_min_slider" minimum="0" maximum="360" stepSize="0.1" value="0" y="80" change="filter()" width="500" toolTip="HUE MIN"/>
</s:Group>
</s:HGroup>
</s:WindowedApplication>
所以,在AIR應用程序使用默認參數應用PixelBender濾波器產生這樣的:
http://i.stack.imgur.com/UyoZR.png
但在Pixel Bender工具包我看到這個具有相同的參數:
http://i.imgur.com/LNnCi.png
更改應用程序中的HUE_MAX滑塊(綁定到MAX_RANGE過濾器參數),它不會平滑過濾掉HUE值,而是在HUE_MAX = 59.9時進行閾值處理,其中較低的值看起來不應用過濾器,並且在HUE_MAX =長相299.9,其中60和299.9之間是這樣的:
http://i.stack.imgur.com/5kePu.png
(對不起,新用戶)
任何想法,我究竟做錯了什麼?
它是因爲我已經用PB很長一段時間時,你不應該在這種情況下使用ShaderFilter問題就解決了,但是?我在代碼中看到了導入,但從未使用。 – RIAstar