PNG to JPG Java ImageIO problem

Question

I have tried both lines of code below to no avail. The code works fine with jpg, or gif but turns the image pink if a png.

ImageIO.write(input, "jpg", profileFile);

RenderedOp op = JAI.create("filestore", input, pFileName, "jpeg");

Anyone else run into this problem? I haven't been able to find a solution.

It is not transparent. I am not sure about the alpha channel. This code is used when a user uploads photos on a website. I convert all photos to JPG and would like to let them use PNG if they happen to have that. — Adam Stokar, Dec 02 '09 at 12:41

score 1 · Answer 1 · edited May 23 '17 at 10:32

1

You have duplicated your question. And there is answer about reported bug in Sun's library and workaround and link.

Problem converting PNG to JPG using Java (ImageIO.write())

edited May 23 '17 at 10:32

Community

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answered Dec 02 '09 at 03:33

score 0 · Answer 2 · edited May 23 '17 at 12:34

0

I'm not sure if this is the right answer or not. But there is another post that suggest that the implementation of JPEG writting with an alpha channel is a bit screwy.

edited May 23 '17 at 12:34

Community

1
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answered Dec 02 '09 at 03:30

monksy

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score 0 · Answer 3 · answered Dec 02 '09 at 03:35

I draw PNGs with the following code and do not run into a problem. It combines multiple PNG images into a single image. The images have transparency, and use bilinear transform for blending.

BufferedImage image = new BufferedImage(BOARD_SIZE, BOARD_SIZE, BufferedImage.TYPE_INT_ARGB); 
Graphics2D g2d = image.createGraphics();
AffineTransformOp transformOp = new AffineTransformOp(new AffineTransform(), AffineTransformOp.TYPE_BILINEAR);
g2d.drawImage(someOtherImage, transformOp, 0, 0);

When I finish the image, I write it to a response using the following code:

OutputStream responseStream = response.getOutputStream();
ImageIO.write(image, "PNG", responseStream);

This writes a png, the OP is trying to write a jpg/jpeg image. — Sean Connolly, Mar 24 '14 at 20:27

PNG to JPG Java ImageIO problem

3 Answers3