show 16bit greyscale BufferedImage on screen

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Mark Trompell - 11 Jan 2004 13:53 GMT

Hi,
I have loaded a 16bit grayscale-tiff to a BufferedImage and want to get
it to screen (using jpanel). But it seems that drawImage can handle only
8bits.
What can I do?
Thx

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Marco Schmidt - 11 Jan 2004 14:15 GMT

Mark Trompell:

>I have loaded a 16bit grayscale-tiff to a BufferedImage and want to get
>it to screen (using jpanel). But it seems that drawImage can handle only
>8bits.

Most graphics modes can't handle more than 8 bits per component
anyway. Or are you interfacing some exotic imaging system?

Regards,
Marco

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Mark Trompell - 11 Jan 2004 15:08 GMT

Marco Schmidt schrieb:

> Most graphics modes can't handle more than 8 bits per component
> anyway. Or are you interfacing some exotic imaging system?

But there must be away to convert it to 8 bit for the displa. At the
Moment drawImage only gives me noise on the screen because it cuts the
higher bits i think.

> Regards,
> Marco

regards Mark

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Marco Schmidt - 11 Jan 2004 19:17 GMT

Mark Trompell:

>But there must be away to convert it to 8 bit for the displa. At the
>Moment drawImage only gives me noise on the screen because it cuts the
>higher bits i think.

BufferedImage#TYPE_USHORT_GRAY should be the right type for 16 bits
grayscale. Are you using that?

You could also create an eight bit version by dropping the least
significant eight bits for display (while keeping the original image
for processing).

Regards,
Marco

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Andrew Thompson - 11 Jan 2004 21:58 GMT

| Marco Schmidt schrieb:
|
[quoted text clipped - 4 lines]
| Moment drawImage only gives me noise on the screen because it cuts the
| higher bits i think.

From what you said to ak..
"I need 16 bits for image processing.
I just need 8 bits for the display."

It would seem the strategy is
a) do the processing at 16 bit
b) lose the 'correct' 8 bits before you
feed it to drawImage...

--
Andrew Thompson
* http://www.PhySci.org/ PhySci software suite
* http://www.1point1C.org/ 1.1C - Superluminal!
* http://www.AThompson.info/andrew/ personal site

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ak - 11 Jan 2004 15:06 GMT

> I have loaded a 16bit grayscale-tiff to a BufferedImage and want to get
> it to screen (using jpanel). But it seems that drawImage can handle only
> 8bits.

ImageroReader converts images to 8 bit.
____________

http://reader.imagero.com the best java image reader.

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Mark Trompell - 11 Jan 2004 15:11 GMT

ak schrieb:

> ImageroReader converts images to 8 bit.

I need 16 bits for image processing. I just need 8 bits for the display.
Regards Mark

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ak - 11 Jan 2004 15:25 GMT

> I need 16 bits for image processing. I just need 8 bits for the display.

then JAI is right thing for you.

____________

http://reader.imagero.com the best java image reader.

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Andrew Thompson - 11 Jan 2004 20:26 GMT

| Hi,
| I have loaded a 16bit grayscale-tiff to a BufferedImage and want to get
| it to screen (using jpanel). But it seems that drawImage can handle only
| 8bits.

There are probably better answers coming..

| What can I do?

Lose 8 bits? (..yes, I am serious)

--
Andrew Thompson
* http://www.PhySci.org/ PhySci software suite
* http://www.1point1C.org/ 1.1C - Superluminal!
* http://www.AThompson.info/andrew/ personal site

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Mark Trompell - 15 Jan 2004 10:48 GMT

Andrew Thompson schrieb:

> | Hi,
> | I have loaded a 16bit grayscale-tiff to a BufferedImage and
[quoted text clipped - 8 lines]
>
> Lose 8 bits? (..yes, I am serious)

Hi, found a way by using DisplayJAI instead of a panel.But the next
problem is at hand, because I want to use threshold just on one
"ROIShape" instead of the whole image.
But I will open a new Thread.
Thank you for help
Regards Mark

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ak - 15 Jan 2004 13:34 GMT

> Hi, found a way by using DisplayJAI instead of a panel.

then you should use PlanarImage, instead of BufferedImage

____________

http://reader.imagero.com the best java image reader.

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show 16bit greyscale BufferedImage on screen

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