cut the portion of bitmap

Question

Possible Duplicate:
How to crop the parsed image in android?

I have selected a portion from the bitmap and i am copying the selected portion in the same bitmap.. Now i want to remove the selected portion after copying.. How to do it?? please help me out..

@Bill-the-Lizard: This is not a duplicate question. – Bhoot Jun 03 '15 at 11:17 — Bhoot, Jun 03 '15 at 11:17

score 156 · Answer 1 · answered Nov 18 '11 at 09:54

156

Just in case someone is trying to solve same problem, there is a better solution: Bitmap.createBitmap(Bitmap, int x, int y, int width, int height). For example, if you need to crop 10 pixels from each side of a bitmap then use this:

Bitmap croppedBitmap = Bitmap.createBitmap(originalBitmap, 10, 10, originalBitmap.getWidth() - 20, originalBitmap.getHeight() - 20);

answered Nov 18 '11 at 09:54

a.ch.

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How can I extract a rectangle from a dynamic bitmap (a bitmap captured from the camera) ? – TharakaNirmana Sep 20 '13 at 06:01
Didn't get your question. The same approach would work - cropping the bitmap is the same as extracting rectangle from it – a.ch. Dec 18 '13 at 06:51
@a.ch. i want to cut the some top side area on image with bitmap... any solution regarding this? – Gorgeous_DroidVirus Mar 14 '14 at 12:33
use the same approach - cut any number of pixels from top – a.ch. Mar 14 '14 at 16:03
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Is there something like that for copying from one bitmap to another, as opposed to allocating a new bitmap? – Kevin Krumwiede Dec 14 '14 at 21:16

score 19 · Accepted Answer · edited Apr 04 '17 at 21:29

19

Easiest way I am aware of is to use XFer mode processing from the Graphics package. Function below cuts region starting from (30,30) till (100,100) to the 320x480 image loaded from resources. Adapt coordinates to change dynamically:

private Bitmap cropBitmap1() {
    Bitmap bmp2 = BitmapFactory.decodeResource(this.getResources(), R.drawable.image1); 
    Bitmap bmOverlay = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);

    Paint paint = new Paint();
    paint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));

    Canvas canvas = new Canvas(bmOverlay); 
    canvas.drawBitmap(bmp2, 0, 0, null); 
    canvas.drawRect(30, 30, 100, 100, paint);

    return bmOverlay;
}

edited Apr 04 '17 at 21:29

Jared Burrows

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answered Mar 25 '11 at 13:04

Zelimir

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hey this will clear the entire bitmap.. i want to clear only the selected portion after copying. – saranya krishnan Mar 25 '11 at 13:06
not entire, just portion. Try and you will see. I checked the code before posting. – Zelimir Mar 25 '11 at 13:09
hai here in the p.setXfermode(new PorterDuffXfermode(Mode.CLEAR)); it shows An error that Assign Statement to a new local variable (CLEAR) what is this – Ramz Feb 08 '12 at 15:45
Looks like you forgot: import android.graphics.PorterDuff.Mode – Zelimir Feb 08 '12 at 16:58
But i want to find distance dynamically. how can i do that? please help me – Denny Sharma Mar 03 '14 at 12:20
Sorry, didn't get it. What distance you want to find? – Zelimir Mar 03 '14 at 15:24
This one saves the day. This is more useful then Bitmap.createBitmap as we can clean/remove any shape pixels from the bitmap and not just adding padding to bitmap. – Rohit Sharma Jun 09 '14 at 13:39

cut the portion of bitmap

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