文章目录
1.程序算法2.应用3.作者答疑1.程序算法
高斯模糊（英语：Gaussian Blur），也叫高斯平滑 ，通常用它来减少图像噪声以及降低细节层次。 从数学的角度来看，图像的高斯模糊过程就是图像与正态分布做卷积。由于正态分布又叫作“高斯分布”，所以这项技术就叫作高斯模糊。AfterEffect(AE)插件是Adobe公司开发的特效制作软件，稳定快速的功能和特效，在视频制作领域使用非常广泛，本文向大家介绍如何在项目里进行高斯特效添加功能。源代码如下所示：
{/*UpgradeLegacyBlurs.jsxUpgrade legacy Gaussian Blur and Fast Blur effects to use the new GPU-accelerated Gaussian Blur*/var repeatEdges = false;function askAboutEdges() {var myWindow = new Window ("dialog", "Upgrade Legacy Blur Effects");myWindow.preferredSize = [320, 70];var myInputGroup = myWindow.add ("group");var check1 = myInputGroup.add ("checkbox", undefined, "Repeat edge pixels for legacy Gaussian Blur effects?");check1.value = false;var myButtonGroup = myWindow.add ("group");myButtonGroup.alignment = "center";myButtonGroup.add ("button", undefined, "OK");myWindow.show ();return check1.value}function getAllComps(totalItems, compItems){for (var i = 1; i <= totalItems; i++){if (app.project.item(i) instanceof CompItem){compItems.push(app.project.item(i));}}return compItems}function getSelectedComps(selectedItems, compItems){if (selectedItems.length != 0){for (var i = 0, ii = selectedItems.length; i < ii; i++){if (selectedItems[i] instanceof CompItem){compItems.push(selectedItems[i]);}}} return compItems}function getComps(){var totalItems = app.project.items.length;var selectedItems = app.project.selection;var compItems = [];if (totalItems < 1){alert("Error: Project is empty.");return null}if (selectedItems.length > 0) {compItems = getSelectedComps (selectedItems, compItems);} else {compItems = getAllComps (totalItems, compItems);}if (compItems.length < 1){alert("Error: No compositions found. Select one or more compositions, or leave nothing selected to upgrade entire project.");return null}return compItems}function getSelectedLayers(targetComp){if (!targetComp()) {return null} var targetLayers = targetComp.selectedLayers;return targetLayers}function getAllLayers(targetComp){var targetLayers = targetComp.layers;return targetLayers}function forEachComposition(compArray,doSomething){for (var i = 0, ii = compArray.length; i < ii; i++){doSomething(compArray[i]);}}function forEachLayer(targetLayerArray, doSomething) {for (var i = 1, ii = targetLayerArray.length; i <= ii; i++){doSomething(targetLayerArray[i]);}}function forEachEffect(targetLayer, doSomething){for (var i = 1, ii = targetLayer.property("ADBE Effect Parade").numProperties; i <= ii; i++) {doSomething(targetLayer.property("ADBE Effect Parade").property(i)); }}function matchMatchName(targetEffect,matchNameString){if (targetEffect != null && targetEffect.matchName === matchNameString) {return targetEffect} else {return null}}function hasKeyframes(targetProperty){return (targetProperty.isTimeVarying && targetProperty.numKeys > 0);}function copyKeyframes(targetProperty){var keyframes = {'keyIndex' : [],'times' : [],'values' : [],'interpolateIn' : [],'interpolateOut' : [],'autobezier' : [],'continuous' : [],'easeIn' : [],'easeOut' : []};for (var i = 1, ii = targetProperty.numKeys; i <= ii; i++){keyframes["keyIndex"].push(i);keyframes["times"].push(targetProperty.keyTime(i));keyframes["values"].push(targetProperty.keyValue(i));keyframes["interpolateIn"].push(targetProperty.keyInInterpolationType(i));keyframes["interpolateOut"].push(targetProperty.keyOutInterpolationType(i));keyframes["autobezier"].push(targetProperty.keyTemporalAutoBezier(i));keyframes["continuous"].push(targetProperty.keyTemporalContinuous(i));keyframes["easeIn"].push(targetProperty.keyInTemporalEase(i));keyframes["easeOut"].push(targetProperty.keyOutTemporalEase(i)); }return keyframes}function collectOldValues(targetProperty){if( hasKeyframes(targetProperty) ){return copyKeyframes(targetProperty)} else {return targetProperty.value}}function collectOldExpression(targetProperty){if (targetProperty.canSetExpression === true && targetProperty.expressionEnabled === true){return targetProperty.expression} else {return null}}function setNewExpression(targetProperty, oldExpression){if (oldExpression != null ) {targetProperty.expression = oldExpression;}}function setNewValues(storedValues,targetProperty){if (storedValues.times === undefined) {targetProperty.setValue(storedValues);} else {targetProperty.setValuesAtTimes(storedValues.times,storedValues.values);for(var i = 0, ii = storedValues.keyIndex.length; i < ii; i++){var key = storedValues.keyIndex[i];if(storedValues.interpolateIn[i] === KeyframeInterpolationType.BEZIER || storedValues.interpolateOut[i] === KeyframeInterpolationType.BEZIER){targetProperty.setTemporalEaseAtKey(key,storedValues.easeIn[i],storedValues.easeOut[i]); }targetProperty.setInterpolationTypeAtKey(key,storedValues.interpolateIn[i],storedValues.interpolateOut[i]);targetProperty.setTemporalContinuousAtKey(key,storedValues.continuous[i]);targetProperty.setTemporalAutoBezierAtKey(key,storedValues.autobezier[i]);}}} function collectCompOpts(sourceEffect){var srcEffectMasks = sourceEffect.property("ADBE Effect Built In Params").property("ADBE Effect Mask Parade"); // Masking Optionsvar compositingOpts = {'maskSet' : [],'effectOpacity' : sourceEffect.property("ADBE Effect Built In Params").property("ADBE Effect Mask Opacity").value};if (srcEffectMasks.numProperties > 0) {// has effect masksfor ( var i = 1, ii = srcEffectMasks.numProperties; i <= ii; i++){compositingOpts.maskSet.push(srcEffectMasks.property(i).property("ADBE Effect Path Stream Ref").value);}} return compositingOpts}function applyCompOpts(compositingOpts, targetEffect) {targetEffect.property("ADBE Effect Built In Params").property("ADBE Effect Mask Opacity").setValue(compositingOpts.effectOpacity);if (compositingOpts.maskSet.length > 0) {// has effect masksfor ( var i = 0, ii = compositingOpts.maskSet.length; i < ii; i++){var fxMasks = targetEffect.property("ADBE Effect Built In Params").property("ADBE Effect Mask Parade"); // Masksvar fxMask1 = fxMasks.addProperty("ADBE Effect Mask").property("ADBE Effect Path Stream Ref");fxMask1.setValue(compositingOpts.maskSet[i]);}} }function upgradeBlur(targetLayer, targetEffect){var compositingOptions = collectCompOpts(targetEffect);var matchName = targetEffect.matchName;var customName = targetEffect.name;var oldBlurriness = collectOldValues(targetEffect.property(matchName + "-0001"));var oldBlurrinessExp = collectOldExpression(targetEffect.property(matchName + "-0001"));var oldDimensions = collectOldValues(targetEffect.property(matchName + "-0002"));var oldDimensionsExp = collectOldExpression(targetEffect.property(matchName + "-0002"));if(matchName === "ADBE Fast Blur"){var oldRepeat = collectOldValues(targetEffect.property(matchName + "-0003"));var oldRepeatExp = collectOldExpression(targetEffect.property(matchName + "-0003"));}var newEffect = targetLayer.property("ADBE Effect Parade").addProperty("ADBE Gaussian Blur 2");applyCompOpts(compositingOptions, newEffect);setNewValues(oldBlurriness,newEffect.property("ADBE Gaussian Blur 2-0001"));setNewExpression(newEffect.property("ADBE Gaussian Blur 2-0001"),oldBlurrinessExp);setNewValues(oldDimensions,newEffect.property("ADBE Gaussian Blur 2-0002"));setNewExpression(newEffect.property("ADBE Gaussian Blur 2-0002"),oldDimensionsExp);if(oldRepeat != undefined){setNewValues(oldRepeat,newEffect.property("ADBE Gaussian Blur 2-0003"));setNewExpression(newEffect.property("ADBE Gaussian Blur 2-0003"),oldRepeatExp);} else {newEffect.property("ADBE Gaussian Blur 2-0003").setValue(repeatEdges);}newEffect.name = customName;}function removeEffect(targetEffect){targetEffect.remove(); }app.beginUndoGroup("Upgrade Legacy Gaussian and Fast Blur Effects");var comps = getComps();if(comps != null) {repeatEdges = askAboutEdges();forEachComposition(comps, function(comp){var targetLayers = getAllLayers(comp); forEachLayer (targetLayers, function(targetLayer){// No effects on Cameras or Lights...if (targetLayer instanceof CameraLayer || targetLayer instanceof LightLayer){return};var existingBlurs = [];forEachEffect (targetLayer, function(targetEffect){// Create new blurs with existing settingsif (matchMatchName (targetEffect, "ADBE Gaussian Blur") || matchMatchName (targetEffect, "ADBE Fast Blur") ){// Store layer indices of old blursexistingBlurs.push(targetEffect.propertyIndex);// Create new ones with their propertiesupgradeBlur (targetLayer,targetEffect);}});// Remove old blursfor (var i = existingBlurs.length, ii = 0; i > ii; i--) {removeEffect(targetLayer.property("ADBE Effect Parade").property(existingBlurs[i - 1]));};// Move the new blurs into placefor (var i = existingBlurs.length, ii = 0; i > ii; i--) {var numEffects = targetLayer.property("ADBE Effect Parade").numProperties;var newBlur = targetLayer.property("ADBE Effect Parade").property(numEffects - i + 1);newBlur.moveTo(existingBlurs[parseFloat(existingBlurs.length - i)]);};});});}app.endUndoGroup;}
2.应用
可以使用此效果创建发光和投影，并使用复合效果将结果应用于原始图像。 对于突出显示和阴影等筛选器，照片处理非常有用。 可以将此效果的输出用于输入到照明效果（如 反射照明 或 漫射照明 效果）中，因为 alpha 通道也模糊不通，照明效果也使用 alpha 通道来确定表面几何图形作为高度地图。内置阴影效果使用此效果。
合理的脚本代码可以有效的提高工作效率，减少重复劳动。
3.作者答疑
如有疑问，敬请留言。
