降低的图像的文件大小 [英] Reduce file size of an image

问题描述

我已经采取了Android相机拍摄照片。结果是一个字节数组。我写它放在SD卡（FileOutputStream中）保存。结果为具有几乎3MB的文件大小的图像。我想减少这种文件大小，所以COM preSS的形象。

I have taken a picture with the android camera. The result is an byte array. I save it by writing it on the sdcard (FileOutputStream). The result is an image with a filesize of nearly 3mb. I would like to reduce this filesize, so compress the image.

如果有可能，以减少文件大小之前，我会写字节数组输出流这将是很好。那是可能的，或者我必须先救它？

It would be nice if it is possible to reduce the filesize before i would write the byte array to the output stream. Is that possible or do I have to save it first?

推荐答案

我通常调整从而降低它的大小图像

I usually resize the image which reduces the size of it

Bitmap bitmap = resizeBitMapImage1(exsistingFileName, 800, 600);

您也可以融为一体preSS与此code图片

You can also compress an image with this code

ByteArrayOutputStream bytes = new ByteArrayOutputStream();
_bitmapScaled.compress(Bitmap.CompressFormat.JPEG, 40, bytes);

//you can create a new file name "test.jpg" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory()
                        + File.separator + "test.jpg")
f.createNewFile();
//write the bytes in file
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());

// remember close de FileOutput
fo.close();

重新上浆code

Re-sizing Code

public static Bitmap resizeBitMapImage1(String filePath, int targetWidth, int targetHeight) {
    Bitmap bitMapImage = null;
    try {
        Options options = new Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, options);
        double sampleSize = 0;
        Boolean scaleByHeight = Math.abs(options.outHeight - targetHeight) >= Math.abs(options.outWidth
                - targetWidth);
        if (options.outHeight * options.outWidth * 2 >= 1638) {
            sampleSize = scaleByHeight ? options.outHeight / targetHeight : options.outWidth / targetWidth;
            sampleSize = (int) Math.pow(2d, Math.floor(Math.log(sampleSize) / Math.log(2d)));
        }
        options.inJustDecodeBounds = false;
        options.inTempStorage = new byte[128];
        while (true) {
            try {
                options.inSampleSize = (int) sampleSize;
                bitMapImage = BitmapFactory.decodeFile(filePath, options);
                break;
            } catch (Exception ex) {
                try {
                    sampleSize = sampleSize * 2;
                } catch (Exception ex1) {

                }
            }
        }
    } catch (Exception ex) {

    }
    return bitMapImage;
}

这篇关于降低的图像的文件大小的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！