位图在Android中压缩PNG – > JPEG,反之亦然

概述当我从PNG转换为JPEG,然后转换为JPEG到PNG时,我的图片大小有问题. public void onClick(View v) { String imageFileName = "/sdcard/Penguins2.png"; File imageFile = new File(imageFileName); if ( 当我从PNG转换为JPEG,然后转换为JPEG到PNG时,我的图片大小有问题.

public voID onClick(VIEw v) {            String imagefilename = "/sdcard/Penguins2.png";            file imagefile = new file(imagefilename);            if (imagefile.exists()) {                // Load the image from file                myBitmap = BitmapFactory.decodefile(imagefilename);                // display the image in the image vIEwer                myImageVIEw = (ImageVIEw) findVIEwByID(R.ID.my_image_vIEw);                if (myImageVIEw != null) {                    myImageVIEw.setimageBitmap(myBitmap);                }            }        }

转换：

private voID processImage() {                   try {        String outputPath = "/sdcard/Penguins2.jpg";        int quality = 100;        fileOutputStream fileOutStr = new fileOutputStream(outputPath);        bufferedoutputstream bufOutStr = new bufferedoutputstream(                fileOutStr);        myBitmap.compress(CompressFormat.JPEG,quality,bufOutStr);        bufOutStr.flush();        bufOutStr.close();    } catch (fileNotFoundException exception) {        Log.e("deBUG_log",exception.toString());    } catch (IOException exception) {        Log.e("deBUG_log",exception.toString());    }    myImageVIEw.setimageBitmap(myBitmap);

处理完这个 *** 作后,我只需更改这些行：

String imagefilename = "/sdcard/Penguins2.png";

至

String imagefilename = "/sdcard/Penguins2.jpg";

和

String outputPath = "/sdcard/Penguins2.jpg";(...)myBitmap.compress(CompressFormat.JPEG,bufOutStr);

至

String outputPath = "/sdcard/Penguins2.png";(...)myBitmap.compress(CompressFormat.PNG,bufOutStr);

图像尺寸从585847更改为531409(在DDMS中)

我想做这样的事情,因为我想使用PNG,它对于某些图像处理是无损的.
然后将图像转换为jpeg并发送为彩信,我不确定,但我认为JPEG只是MMS中所有设备支持的格式.接收器将打开图像并将其转换回png而不会丢失数据.

解决方法 除了@Sherif elKhatib答案,如果您查看文档： http://developer.android.com/reference/android/graphics/Bitmap.html#compress%28android.graphics.Bitmap.CompressFormat,%20java.io.OutputStream%29

您可以看到PNG图像不使用质量参数：

quality: Hint to the compressor,0-100. 0 meaning compress for small size,100 meaning compress for max quality. Some formats,like PNG which is lossless,will ignore the quality setting

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