Javascript 用色彩平衡调整色彩
在JavaScript中,我可以使用如下函数调整图像的颜色平衡Javascript 用色彩平衡调整色彩,javascript,colors,photoshop-script,Javascript,Colors,Photoshop Script,在JavaScript中,我可以使用如下函数调整图像的颜色平衡 colorBalanceLayer(-50,0,0) function colourBalanceLayer(cya, mag, yel) { // cyan, magenta, yellow values are between -100 & +100 var id713 = charIDToTypeID( "ClrB" ); var desc162 = new ActionDescriptor();
colorBalanceLayer(-50,0,0)
function colourBalanceLayer(cya, mag, yel)
{
// cyan, magenta, yellow values are between -100 & +100
var id713 = charIDToTypeID( "ClrB" );
var desc162 = new ActionDescriptor();
var id714 = charIDToTypeID( "ShdL" );
var list37 = new ActionList();
list37.putInteger( 0 );
list37.putInteger( 0 );
list37.putInteger( 0 );
desc162.putList( id714, list37 );
var id715 = charIDToTypeID( "MdtL" );
var list38 = new ActionList();
list38.putInteger( cya );
list38.putInteger( mag );
list38.putInteger( yel );
desc162.putList( id715, list38 );
var id716 = charIDToTypeID( "HghL" );
var list39 = new ActionList();
list39.putInteger( 0 );
list39.putInteger( 0 );
list39.putInteger( 0 );
desc162.putList( id716, list39 );
var id717 = charIDToTypeID( "PrsL" );
desc162.putBoolean( id717, true );
executeAction( id713, desc162, DialogModes.NO );
}
这很好,在我的示例中,在图像的中间色调中添加了大量青色。我想知道的是:如果我想将RGB颜色修改为-50青色的类似值(如上面的示例),我将如何进行?最好将颜色更改为CMKY,适当调整,然后再更改回RGB。只有我在某个地方读到,我最好先从RGB转到L*ab(我知道怎么做)。如果你想在RGB颜色上使用该功能,你必须将其转换为CMY,因为
colorBalanceLayer
设计用于CMY颜色。可通过以下功能轻松完成:
// r, g, b and c, m, y are in the range of 0 to 255
function rgb_cmy(r, g, b) {
return [].map.call(arguments, function(v) {return 255 - v;});
}
// return value is an array of the form: [cyan, magenta, yellow]
rgb_cmy(c, m, y) // returns an array of the form: [red, green, blue]
处理后,使用相同的功能转换回RGB:
// r, g, b and c, m, y are in the range of 0 to 255
function rgb_cmy(r, g, b) {
return [].map.call(arguments, function(v) {return 255 - v;});
}
// return value is an array of the form: [cyan, magenta, yellow]
rgb_cmy(c, m, y) // returns an array of the form: [red, green, blue]
我们是否应该将L*ab转换为中间步骤编号
RGB和CMY是两个大小相同的不同颜色空间:这意味着:它们都包含相同数量的颜色。但这两个空间并不完全覆盖彼此。这意味着:RGB包含一些不能精确表示为CMY颜色的颜色,反之亦然。因此,每次转换都会引入一些不精确性
L*ab颜色空间比其他颜色空间大得多,完全覆盖RGB和CMY。这意味着:每个RGB(或CMY)颜色都可以精确地表示为L*ab颜色,但有许多L*ab颜色无法用RGB或CMY表示
RGB颜色与CMY不完全匹配,出现以下情况:
RGB --inaccurate--> CMY --inaccurate--> RGB // output !== input
RGB --accurate--> L*ab --inaccurate--> CMY --accurate--> L*ab --inaccurate--> RGB
我们看到同样的误差也被引入
EDIT在colorBalanceLayer
内部调用一些其他函数。我看不出他们到底在做什么,所以我只能作为草稿给出以下内容
当然,可以在RGB颜色中更改青色、洋红或黄色,而无需任何转换。为此,我们需要知道两件事:
1) CMY与印刷颜料一起工作,RGB与发射光一起工作,因此它们在亮度上是互补的。这意味着:向CMY添加一些值会使颜色更暗,向RGB添加一些值会使颜色更亮
2) RGB和CMY的色轮旋转60度,因此它们的颜色互补。这意味着:两者的相反颜色构成互补对青色/红色、品红/绿色和黄色/蓝色
因此,以下操作会导致相同的结果(CMY左侧,RGB右侧):
可以调整您的函数,使其也能与RGB一起工作。回答我自己的问题:可以返回“平衡”颜色的值。这不是一个优雅的解决方案:
colourBalanceLayer("C0FFEE", 100,0,0);
function colourBalanceLayer(hexcol, cya, mag, yel)
{
var pixH = 10;
var pixV = 10;
// create a document to work with
var docRef = app.documents.add(pixH *2, pixV *2, 72, "colours")
var newDoc = app.activeDocument;
// =======================================================
var id70 = charIDToTypeID( "Fl " );
var desc18 = new ActionDescriptor();
var id71 = charIDToTypeID( "From" );
var desc19 = new ActionDescriptor();
var id72 = charIDToTypeID( "Hrzn" );
var id73 = charIDToTypeID( "#Pxl" );
desc19.putUnitDouble( id72, id73, 10.000000 );
var id74 = charIDToTypeID( "Vrtc" );
var id75 = charIDToTypeID( "#Pxl" );
desc19.putUnitDouble( id74, id75, 9.000000 );
var id76 = charIDToTypeID( "Pnt " );
desc18.putObject( id71, id76, desc19 );
var id77 = charIDToTypeID( "Tlrn" );
desc18.putInteger( id77, 32 );
var id78 = charIDToTypeID( "AntA" );
desc18.putBoolean( id78, true );
var id79 = charIDToTypeID( "Usng" );
var id80 = charIDToTypeID( "FlCn" );
var id81 = charIDToTypeID( "FrgC" );
desc18.putEnumerated( id79, id80, id81 );
executeAction( id70, desc18, DialogModes.NO );
// cyan, magenta, yellow values are between -100 & +100
var id713 = charIDToTypeID( "ClrB" );
var desc162 = new ActionDescriptor();
var id714 = charIDToTypeID( "ShdL" );
var list37 = new ActionList();
list37.putInteger( 0 );
list37.putInteger( 0 );
list37.putInteger( 0 );
desc162.putList( id714, list37 );
var id715 = charIDToTypeID( "MdtL" );
var list38 = new ActionList();
list38.putInteger( cya );
list38.putInteger( mag );
list38.putInteger( yel );
desc162.putList( id715, list38 );
var id716 = charIDToTypeID( "HghL" );
var list39 = new ActionList();
list39.putInteger( 0 );
list39.putInteger( 0 );
list39.putInteger( 0 );
desc162.putList( id716, list39 );
var id717 = charIDToTypeID( "PrsL" );
desc162.putBoolean( id717, true );
executeAction( id713, desc162, DialogModes.NO );
// =======================================================
var id40 = charIDToTypeID( "setd" );
var desc11 = new ActionDescriptor();
var id41 = charIDToTypeID( "null" );
var ref5 = new ActionReference();
var id42 = charIDToTypeID( "Clr " );
var id43 = charIDToTypeID( "FrgC" );
ref5.putProperty( id42, id43 );
desc11.putReference( id41, ref5 );
var id44 = charIDToTypeID( "T " );
var desc12 = new ActionDescriptor();
var id45 = charIDToTypeID( "Rd " );
desc12.putDouble( id45, 255.000000 );
var id46 = charIDToTypeID( "Grn " );
desc12.putDouble( id46, 255.000000 );
var id47 = charIDToTypeID( "Bl " );
desc12.putDouble( id47, 255.000000 );
var id48 = charIDToTypeID( "RGBC" );
desc11.putObject( id44, id48, desc12 );
executeAction( id40, desc11, DialogModes.NO );
var selRegion = null;
selRegion = Array(Array(pixH, pixV),
Array(pixH + 1, pixV),
Array(pixH + 1, pixV + 1),
Array(pixH, pixV + 1),
Array(pixH, pixV));
newDoc.selection.select(selRegion);
var histR = newDoc.channels.getByName("Red").histogram;
var histG = newDoc.channels.getByName("Green").histogram;
var histB = newDoc.channels.getByName("Blue").histogram;
var returnColor = new RGBColor();
for (iHistR in histR)
{
if (histR[iHistR]!=0)
{
returnColor.red = iHistR;
}
}
for (iHistG in histG)
{
if(histG[iHistG]!=0)
{
returnColor.green = iHistG;
}
}
for (iHistB in histB)
{
if(histB[iHistB]!=0)
{
returnColor.blue = iHistB;
}
}
alert(returnColor.red+","+returnColor.green+","+returnColor.blue);
return returnColor;
}
谢谢你的解释。现在我需要做的就是关联颜色平衡变化的值。RGB128128128+100红色变为156,97,97&60,60,60,变为91,33,33。看起来红移了30次,其他的红移了30次。我必须进一步调查以获得更准确的值。@ghoullfool更改颜色平衡必须保持颜色的亮度稳定。因此,如果
red+=50
应该有green-=25
和blue-=25
。