Memory problem when scaling image

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Memory is adding when setting the width and height larger than the original image
Sample I have 1000x1000 image. Scaling it to 900x900 / 800x800 memory is steady but when larger the memory keeps increasing.

Use this in image zooming

Java

private BufferedImage scale(BufferedImage image, double newwidth, double newheight) {
    if(newwidth > 3 && newheight > 3) {
        BufferedImage resizedImage = new BufferedImage((int) newwidth , (int) newheight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = resizedImage.createGraphics();
        if(newwidth < image.getWidth() || newheight < image.getHeight()) {
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
            g.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
            g.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_DISABLE);
            g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_OFF);
            g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
            g.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_TEXT_LCD_CONTRAST, 250);
        }
        g.drawImage(image, 0, 0, (int) newwidth , (int) newheight , null);
        g.dispose();
        System.gc();
        return resizedImage;
    } else {
        return (BufferedImage) image;
    }
}

This is what happened.
1st Zoom - 1100x1100 -> memory 200MB
2nd Zoom - 1200x1200 -> memory 250MB
3rd Zoom - 1200x1200 -> memory 300MB
and so on till memory is up to 1 gig

even if I reopen another image memory is still the same

Posted 1-Apr-15 20:34pm

hansoctantan

Updated 1-Apr-15 23:25pm

v3

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Comments

Darren_vms 2-Apr-15 4:39am

what are you expecting to happen when the image is made larger ? why do you feel this is a problem ?

hansoctantan 2-Apr-15 5:22am

updated my question. hope it helps

Richard MacCutchan 2-Apr-15 5:31am

Every time you zoom you are increasing the amount of memory required to hold the image. How do you expect to do this without increasing it?

hansoctantan 2-Apr-15 5:32am

is there a way to release this used memory?

Richard MacCutchan 2-Apr-15 6:20am

Yes, release the image resources that are using it.

hansoctantan 2-Apr-15 6:28am

I have this function but same, I guess this is the result on enlarging the image
private void clearImage() {
image.flush();
image = null;
label.setIcon(null);
garbageCollect();
}

private void garbageCollect() {
Runtime.getRuntime().gc();
System.gc();
}

Richard MacCutchan 2-Apr-15 6:53am

You should not call ``gc'' directly, as the JVM is always working to collect unused resources. If the memory size is always increasing then it suggests that you are not releasing some space correctly.

hansoctantan 2-Apr-15 6:57am

the increase is always on scale. sizing up the image, other than that its ok

rotation, even if the condition enters the RenderingHint. memory is ok

Richard MacCutchan 2-Apr-15 6:59am

Then that should give you a clue where to look for the problem.

Darren_vms 2-Apr-15 6:06am

I would have to ask why ? is it important to low memory usage ? if so then java may not be the best language.

You can call repeatedly

System.gc();

this should reduce the heap and return memory and the number of times it needs to be called depends on the GC algorithm.

hansoctantan 2-Apr-15 6:09am

in these case its normal?

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Darren_vms · Answer 1 · 2015-04-02T02:16:00

Solution 1

To move this forward it would be better to know

What heap size are you allowing ?
Have you tried different GC ? (example -XX:+UseG1GC)
Have you tried setting Min and MaxFreeRatio ?

Also play with the GC settings and min/maxfreeRatio.

As Richard pointed out you need to confirm that the image resources are released, I see image is cleared but what about resizedImage ?

Posted 2-Apr-15 2:16am

Darren_vms

Comments

hansoctantan 2-Apr-15 8:32am

how can i release the resizedImage when its the return of the method.
This is my 1st time manipulating image in java and 1st time to concern about the memory