缩放图像时的内存问题 [英] Memory problem when scaling image

问题描述

设置宽度和高度大于原始图像时添加内存

示例我有1000x1000图像。将其缩放到900x900 / 800x800内存是稳定的，但是当内存不断增大时，内存会不断增加。



在图像缩放中使用它

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

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;
    }
}

这就是发生的事情。

1st Zoom - 1100x1100 - >内存200MB

第二放大 - 1200x1200 - >内存250MB

第3缩放 - 1200x1200 - >内存300MB

等等，直到内存达到1 gig



即使我重新打开另一个图像内存仍然是相同的

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

推荐答案

为了向前移动，最好知道



你允许什么堆大小？

您尝试过不同的GC吗？ （示例-XX：+ UseG1GC）

您是否尝试过设置Min和MaxFreeRatio？



还可以使用GC设置和min / maxfreeRatio 。



正如理查德指出你需要确认图像资源是否已经发布，我看到图像被清除但是resizedImage呢？

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 ?

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