Change X & Y Density and Color Depth of JPEG Image

Asked May 09 '20 at 15:20

Active May 18 '20 at 09:28

Viewed 434 times

I want to change jpeg image density from 96 to 100 dpi and bit depth should be 8 bit.

I'm using below code.

    BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
    JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(os1);
    JPEGEncodeParam jpegEncodeParam = jpegEncoder.getDefaultJPEGEncodeParam(bufferedImage);
    jpegEncodeParam.setDensityUnit(JPEGEncodeParam.DENSITY_UNIT_DOTS_INCH);
    jpegEncoder.setJPEGEncodeParam(jpegEncodeParam); 
    jpegEncodeParam.setQuality(0.40f, true);
    jpegEncodeParam.setXDensity(100); 
    jpegEncodeParam.setYDensity(100);
    jpegEncoder.encode(bufferedImage, jpegEncodeParam);
    bufferedImage.flush();

It's working fine but in this code Java API showing warning message that is Access restriction: The type 'JPEGImageEncoder' is not API (restriction on required library ...). and Maven build also by this.

Also tried ImageIO library but It only helps in bit depth and not able to change dpi.

edited May 18 '20 at 09:28

asked May 09 '20 at 15:20

Ravi S.

1

See [this answer](https://stackoverflow.com/a/17649916/1428606) for how to set DPI in JPEG using ImageIO. – Harald K May 11 '20 at 14:08
When you say *"bit depth should be 8"*, do you mean the output should be 8 bits per channel (24 bit for RGB/8 bit for gray) or something else? – Harald K May 11 '20 at 14:14
1

@haraldK it means 8 bit for gray – Ravi S. May 13 '20 at 10:20

Change X & Y Density and Color Depth of JPEG Image

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