B4J Question GetPixels in Non-UI

techknight

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• Nov 28, 2018

• #2

Me too. But for a very different reason.

 

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stevel05

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• Nov 28, 2018

• #3

java awt has a PixelGrabber class, I don't know how to use it myself but I'm sure you can work it out with a bit of investigation. https://docs.oracle.com/javase/7/docs/api/java/awt/image/PixelGrabber.html

 

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Erel

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• Nov 29, 2018

• #4

The best option to extract pixels from a bitmap is with BitmapCreator. BitmapCreator does rely on JavaFX however it might work in a non-ui project. You should try it.

 

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Blueforcer

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• Nov 29, 2018

• #5

I cant use any JavaFX related function

 

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DonManfred

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• Nov 29, 2018

• #6

Blueforcer said:

I cant use any JavaFX related function

Click to expand...

you did read @Erel answer above yours?

 

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Blueforcer

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• Nov 29, 2018

• #7

of course. he said "BitmapCreator does rely on JavaFX"
But because i cant install javaFX or openjfx on my platform, i cant use it.
Even if i just use the type paint it throws an exeption "noClassDefFoundError"

With BitmapCreator the error is:
java.lang.NoClassDefFoundError: javafx/scene/Node

 

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DonManfred

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• Nov 29, 2018

• #8

Ohh, MY fault! I DID not read correctly :-(

 

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Erel

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• Nov 29, 2018

• #9

Blueforcer said:

But because i cant install javaFX or openjfx on my platform

Click to expand...

Which platform?

 

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Blueforcer

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• Nov 29, 2018

• #10

Its my NAS. The JRE is a thirdparty port, but without JavaFX.
Maybe its possible to read the bytes from a raw BMP and convert it back to its colors? I dont know

 

Last edited: Nov 29, 2018

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Erel

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• Nov 29, 2018

• #11

Blueforcer said:

Maybe its possible to read the bytes from a raw BMP and convert it back to its colors?

Click to expand...

It is possible. It is not too complicated if you use the 32 bit format.

Example of writing a BMP file: https://www.b4x.com/android/forum/threads/b4x-convert-bitmap-to-bmp-format.94420/#content

 

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