用于批量更改打开的图片的尺寸的photoshop 脚本 (javascript)。

操作对象：

当前打开的所有文档；（注意不要有尚未保存过的新建的文档，或无法直接保存的文档，否则会中断批处理）

用法：

把解压出来的 “改变尺寸.jsx” 文件复制到 “ps安装目录\预置\脚本” 下，重新打开ps以后就可以在~
[菜单- 文件-脚本] 里面找到 “改变尺寸”

或者解压出来，在开着ps的情况下，直接双击也可以用。

操作结果：

直接覆盖保存并关闭文档。（最好复制一个文件夹，然后再打开图片执行这个操作，不然就没有原始文件喽）

目前只在cs3中文版上测试通过 

若其他ps版本有问题，或者有什么bug还请多多反馈！谢谢！
对这个没什么研究，刚学~尚苦于没有资料，更欢迎高人多多指点

v1.0版本下载（old）

附上代码，方便大家指正：

#target photoshop
app.bringToFront();
// 带自动判断横竖的统一长宽操作，对当前所有打开文档进行操作。因为是直接保存关闭，原文件要注意备份！
if (app.documents.length == 0){
    alert("请打开至少一个文件");
}else{
var PRESOLUTION = 72;
app.preferences.rulerUnits = Units.PIXELS;
        
res ="dialog { \
text:'批量尺寸调整 - 直接覆盖保存-请注意备份',\
        group: Group{orientation: 'column',alignChildren:'left',\
                corrdination: Panel { orientation: 'row', \
                        text: '需要尺寸', \
                                x: Group { orientation: 'row', \
                                        s: StaticText { text:'长:' }, \
                                        e: EditText { preferredSize: [50, 20] } ,\
                                        p: StaticText { text:'pixel' }, \
                                        }, \
                                y: Group { orientation: 'row', \
                                        s: StaticText { text:'宽:' }, \
                                        e: EditText { preferredSize: [50, 20] }, \
                                        p: StaticText { text:'pixel' }, \
                                        } \
                                },  \
                        a:Group{ orientation: 'row', \
                                c: Checkbox { preferredSize: [16, 16]} ,\
                                s: StaticText {text:'保持原图长宽比，新尺寸仅作外框限定'},\
                                }, \
                        b:Group{ orientation: 'row', \
                                c: Checkbox { preferredSize: [16, 16]} ,\
                                s: StaticText {text:'不判断原图横竖'},\
                                }, \
                },\
        buttons: Group { orientation: 'row', alignment: 'right',\
                Btnok: Button { text:'确定', properties:{name:'ok'} }, \
                Btncancel: Button { text:'取消', properties:{name:'cancel'} } \
                } \
}";
win = new Window (res);
win.buttons.Btncancel.onClick = function () {
this.parent.parent.close();
}
win.group.a.c.onClick = function(){ //如果勾选了a,则b被锁定
        if(win.group.a.c.value){
                win.group.b.c.value=true;
        }
}
win.group.b.c.onClick = function(){
        if(win.group.a.c.value){
                win.group.b.c.value=true;
        }
}
win.buttons.Btnok.onClick = function () {
    
                var x=Number(win.group.corrdination.x.e.text);
                var y=Number(win.group.corrdination.y.e.text);
                var a=win.group.a.c.value;
                var b=win.group.b.c.value; //选中则不颠倒横竖，以输入值为准
                
                if (!b && x<y){  //确保PW>=PH
                        var PW=y
                        var PH=x
                        }else{
                        var PW=x
                        var PH=y
                        }    
    while (app.documents.length){
    var docRef = app.activeDocument; // 当前活动文档为操作对象    
                var dw = docRef.width;
                var dh = docRef.height;
                var fw = PW;
                var fh = PH;
                if(!b && dh>dw){
                    fw = PH;
                    fh = PW;
                }
                if(a){
                    w1 =dw/fw;
                    h1 =dh/fh;
                    if(w1>h1){
                        fh =dh/w1;    
                    }else{
                        fw =dw/h1;
                    }
                }
        docRef.resizeImage(fw, fh, PRESOLUTION, ResampleMethod.BICUBIC);
        docRef.save();
        docRef.close(); //关闭当前文档
}
this.parent.parent.close();
}
win.center();
win.show();
}

v1.11版本下载

可以把当前文档（包括未保存过的）直接修改尺寸并保存为jpg。（注意会关闭当前文档！）
可以针对整个文件夹进行操作。(程序设定为“不包括隐藏文件”，因此不想处理和不能处理的文件可以先设置为[隐藏]属性)
可选择另存jpg 至另一个文件夹。
另存时支持文件名前后添加字符。

附上代码，方便大家指正：

#target photoshop
app.bringToFront();
// 带自动判断横竖的统一长宽操作。默认是直接保存关闭，原文件要注意备份！ v1.11 - 2008.2.23
var PRESOLUTION = 72;
app.preferences.rulerUnits = Units.PIXELS;
        
res ="dialog { \
text:'批量尺寸调整 ',\
        group: Group{orientation: 'column',alignChildren:'left',\
                top:StaticText{text:'默认为直接覆盖保存 - 请注意选择或做好备份',align:'left'},\
                corrdination: Panel { orientation: 'row', \
                        text: '需要尺寸', \
                                x: Group { orientation: 'row', \
                                        s: StaticText { text:'宽:' }, \
                                        e: EditText { preferredSize: [50, 20] } ,\
                                        p: StaticText { text:'px' }, \
                                        }, \
                                y: Group { orientation: 'row', \
                                        s: StaticText { text:'高:' }, \
                                        e: EditText { preferredSize: [50, 20] }, \
                                        p: StaticText { text:'px' }, \
                                        } ,\
                                }, \
                a:Group{ orientation: 'row', \
                                c: Checkbox { preferredSize: [16, 16]} ,\
                                s: StaticText {text:'保持原图长宽比，新尺寸仅作外框限定'},\
                                }, \
                b:Group{ orientation: 'row', \
                                c: Checkbox { preferredSize: [16, 16]} ,\
                                s: StaticText {text:'不判断原图横竖'},\
                                }, \
                now:Group{ orientation: 'row', \
                                c: Checkbox { preferredSize: [16, 16]} ,\
                                s: StaticText {text:'对文件夹进行操作（否则处理所有目前打开的文档）'},\
                                }, \
                folderO:Group{ orientation: 'row', \
                                b: Button {text:'待处理文件夹', properties:{name:'open'} ,helpTip:'选择您需要处理的文件所在的文件夹'},\
                                s: EditText  { text:'', preferredSize: [180, 20] },\
                                },\
                other:Group{ orientation: 'row', \
                                c: Checkbox { preferredSize: [16, 16]} ,\
                                s: StaticText {text:'启用另存 (jpg格式)'},\
                                }, \
                otherSet: Panel {orientation: 'column',alignChildren:'left',\
                        text: '另存设置', \
                        Quality: Group { orientation: 'row',  \
                                    s: StaticText { text:'Jpeg压缩质量:' }, \
                                    e: EditText { preferredSize: [30, 20] ,text:'7'} ,\
                                    s: StaticText { text:'(0-12,数值越大质量越高)' }, \
                                    }, \
                        head: Group { orientation: 'row',  \
                                    s: StaticText { text:'在文件名前添加字符:' }, \
                                    e: EditText { preferredSize: [50, 20] } ,\
                                    }, \
                        foot: Group { orientation: 'row',  \
                                    s: StaticText { text:'在文件名后添加字符:' }, \
                                    e: EditText { preferredSize: [50, 20] }, \
                                    } ,\
                        otherF:Group{ orientation: 'row', \
                                    c: Checkbox { preferredSize: [16, 16]} ,\
                                    s: StaticText {text:'另存至其他文件夹'},\
                                    }, \
                        folderS:Group{ orientation: 'row', \
                                    b: Button {text:'另存至', properties:{name:'save'} ,helpTip:'选择您处理好的文件要保存至的文件夹'},\
                                    s: EditText  { text:'', preferredSize: [180, 20] },\
                                    },\
                        },\
                },\
        buttons: Group { orientation: 'row', alignment: 'right',\
                Btnok: Button { text:'确定', properties:{name:'ok'} }, \
                Btncancel: Button { text:'取消', properties:{name:'cancel'} } \
                }, \
}";
win = new Window (res);
win.buttons.Btncancel.onClick = function () {
this.parent.parent.close();
}
function lock_b(){  //如果勾选了a,则b被锁定
        if(win.group.a.c.value){
                win.group.b.c.value=true;
        }
    }
win.group.a.c.onClick =function() { lock_b()};
win.group.b.c.onClick =function() { lock_b()};
// 打开文件夹的操作
var folderOpen=win.group.folderO
var folderSave=win.group.otherSet.folderS
folderOpen.b.onClick = function() {
        var defaultFolder = folderOpen.s.text;
        var testFolder = new Folder(defaultFolder);
        if (!testFolder.exists) {
            defaultFolder = "~";
        }
        var selFolder = Folder.selectDialog("选择待处理文件夹", defaultFolder);
        if ( selFolder != null ) {
            folderOpen.s.text = selFolder.fsName;
            folderOpen.s.helpTip = selFolder.fsName.toString();
        }
}
folderSave.b.onClick = function() {
        var defaultFolder = folderSave.s.text;
        var testFolder = new Folder(defaultFolder);
        if (!testFolder.exists) {
            defaultFolder = "~";
        }
        var selFolder = Folder.selectDialog("选择要储存至的文件夹", defaultFolder);
        if ( selFolder != null ) {
            folderSave.s.text = selFolder.fsName;
            folderSave.s.helpTip = selFolder.fsName.toString();
        }
}
// 初始化选项
win.group.folderO.enabled =false;
win.group.otherSet.enabled =false;
//操作文件夹开关
win.group.now.c.onClick =function(){
    if (win.group.folderO.enabled) {
        win.group.folderO.enabled =false;
        }else{
        win.group.folderO.enabled =true;
        }
}
//另存开关
win.group.other.c.onClick =function(){
    if (win.group.otherSet.enabled) {
        win.group.otherSet.enabled =false;
        }else{
        win.group.otherSet.enabled =true;
        if (!win.group.otherSet.otherF.c.value) {win.group.otherSet.folderS.enabled =false}
        }
}
//另存至文件夹开关
win.group.otherSet.otherF.c.onClick =function(){
    if (win.group.otherSet.folderS.enabled) {
        win.group.otherSet.folderS.enabled =false;
        }else{
        win.group.otherSet.folderS.enabled =true;
        }
}
// 实际处理开始
function newsize(docRef,a,b,PW,PH){ //改变图象尺寸函数
            var dw = docRef.width;
            var dh = docRef.height;
            var fw = PW;
            var fh = PH;
            if(!b && dh>dw){
                fw = PH;
                fh = PW;
            }
            if(a){
                w1 =dw/fw;
                h1 =dh/fh;
                if(w1>h1){
                    fh =dh/w1;    
                }else{
                    fw =dw/h1;
                }
            }
    docRef.resizeImage(fw, fh, PRESOLUTION, ResampleMethod.BICUBIC);
}
function save(docRef) {    //储存函数
        if (win.group.other.c.value){ //判断是否另存
            
                docRef.flatten() ;//合并图层，以储存jpg
                docRef.changeMode(ChangeMode.RGB); // 更改为rgb模式，避免其它模式无法储存                
                var jpegOptions = new JPEGSaveOptions();
                var setquality = Number(win.group.otherSet.Quality.e.text);
                if (setquality>12) {
                    setquality=12;
                }else if (setquality<0) {
                    setquality=0;
                }
                jpegOptions.quality = setquality;
                
                // 获取另存文件夹及前后追加字段
                var headWord = win.group.otherSet.head.e.text;
                var footWord = win.group.otherSet.foot.e.text;    
                
                if (win.group.otherSet.otherF.c.value){ //如果选中另存至文件夹
                            if (win.group.otherSet.folderS.s.text){
                                var saveFolder = win.group.otherSet.folderS.s.text+"/";    
                            }else{    
                                var saveFolder = docRef.path+"/newsize_";  //容错，避免没有具体选择另存到那个文件夹
                            }
                }else{
                            if (headWord || footWord){
                                var saveFolder = docRef.path+"/";
                            }else{
                                var saveFolder = docRef.path+"/newsize_"; //容错，避免没有添加前后缀而保存在本文件夹
                            }
                }
                                
            docRef.saveAs(new File(saveFolder + headWord +docRef.name.substring(0,docRef.name.lastIndexOf('.'))  + footWord + ".jpg"),jpegOptions);    //设定输出文件名称            
        }else{
            docRef.save();
        }
        docRef.close(SaveOptions.DONOTSAVECHANGES); //关闭当前文档    
}
win.buttons.Btnok.onClick = function () {    
        var x=Number(win.group.corrdination.x.e.text);
        var y=Number(win.group.corrdination.y.e.text);
        var a=win.group.a.c.value;
        var b=win.group.b.c.value; //选中则不颠倒横竖，以输入值为准
        
        if (!b && x<y){  //确保PW>=PH
                var PW=y
                var PH=x
                }else{
                var PW=x
                var PH=y
                }    
            
        if (!win.group.now.c.value) {  // 当前活动文档为操作对象    
                while (app.documents.length){
                        var docRef = app.activeDocument;
                        newsize(docRef,a,b,PW,PH);
                        save(docRef);
                }
        }else{ // 文件夹为操作对象            
                var openFolder = Folder(win.group.folderO.s.text);                
                var fileList = openFolder.getFiles() //获取open文件夹下所有文件
                for (i=0;i<fileList.length;i++){
                    if (fileList[i] instanceof File && fileList[i].hidden == false){ //不处理隐藏文件
                        open(fileList[i]);
                        var docRef = app.activeDocument;
                        newsize(docRef,a,b,PW,PH);
                        save(docRef);
                    }
                }
        }
this.parent.parent.close();
}
win.center();
win.show();