Question

我正在写一些将被压缩的Image文本。

图片sie 2048 x 1536某事px

我首先尝试先写它会抛出OutOfMemory Exception

然后我首先将其压缩为1024 x 768

然后在图像上写文字

它将图片KB从100KB增加到640KB

在撰写文字时我可以compromise Image quality but not the text Quality

将压缩质量设置为30，文字也会downsample

问题：

是否有write then compress或Compress then Write的任何流程文本而不更改ImageSize（以KB为单位）？
我希望图像尺寸（以KB为单位）尽可能少吗？
并且当inSampleSize设置为3时它不起作用，并且仅创建使用1,2,4的2048,1024,512的图像作为输出我想要一些大小为700px维持宽高比的图像。

代码：

StampingImage方法

public void stampMyImage(String filePath, String text, Bitmap bitmap) {
        String[] str = text.split("\n");
        filePath = "/sdcard/geoTag/1imagelong_001_001_0002_0002_1135_130708144229.jpg";
        bitmap = BitmapFactory.decodeFile(filePath);
        if (bitmap != null) {
            Bitmap dest = null;
            try {
                dest = bitmap.copy(bitmap.getConfig(), true);
            } catch (OutOfMemoryError e1) {
                Log.e("Exception", e1.getMessage());
                e1.printStackTrace();
            } catch (Error e) {
                Log.e("Exception", e.getMessage());
                e.printStackTrace();
            }
            Canvas cs = new Canvas(dest);
            Typeface tf = Typeface.create("Verdana", Typeface.BOLD);
            Paint tPaint = new Paint();
            tPaint.setAntiAlias(true);
            tPaint.setTextSize(40);
            tPaint.setTextAlign(Align.LEFT);
            tPaint.setTypeface(tf);
            tPaint.setColor(Color.RED);
            tPaint.setStyle(Style.FILL_AND_STROKE);
            cs.drawBitmap(bitmap, 0f, 0f, null);
            float textHeight = tPaint.measureText("yY");
            int index = 0;
            for (String Oneline : str) {
                cs.drawText(Oneline, 20f, (index + 1) * textHeight + 25f,
                        tPaint);
                index++;
            }
            try {
                FileOutputStream fos = new FileOutputStream(
                        "/sdcard/timeStampedImage.jpg");
                dest.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
    }

常规压缩方法

 BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 4;
    int quality = 70;
    myBitmapClose = BitmapFactory.decodeFile(imgUriClose.getPath(),options);
    if (myBitmapClose != null) {
        File sdImageMainDirectory = new File(imgUriClose.getPath());
        try {
        FileOutputStream fileOutputStream = new FileOutputStream(sdImageMainDirectory);
        BufferedOutputStream bos = new BufferedOutputStream(fileOutputStream);
        myBitmapClose.compress(CompressFormat.JPEG, quality, bos);
        if (bos != null) {
        bos.flush();
        bos.close();
        }
        if (fileOutputStream != null) {
        fileOutputStream.flush();
        fileOutputStream.close();
        }
        } catch (FileNotFoundException e) {
        e.printStackTrace();
        } catch (IOException e) {
        e.printStackTrace();
        }

图像样本 The Sample Image with Text Written on it

另见

我遵循的一些有用的链接

How to write text on an image in Java (Android)

Generate a image with custom text in Android

Drawing Text (TimeStamp) Over image captured from Standalone Camera

Answer 1

您的问题是您的应用允许的分配内存。将图像加载到位图变量（decodeFile或bitmap.copy）时，尝试设置选项以降低图像质量。例如，当你执行bitmap.copy时，尝试设置如下选项：

bitmap.copy(Bitmap.Config.ARGB_4444, true);

在图像上写文字而不增加大小？

1 个答案: