Hi !
Featured games (85)
games approved by the League of Dukes
Games in Showcase (636)
Games in Android Showcase (178)
games submitted by our members
Games in WIP (688)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Alpha raster  (Read 981 times)
0 Members and 1 Guest are viewing this topic.
Offline Walrus

Junior Newbie

Java games rock!

« Posted 2004-09-21 16:09:20 »

I'm trying to recolour images and have run into a slight problem.

colourImage holds a block of the relevant colour and greyImage holds a greyscale image. The following two lines are supposed to put the greyscale image into colourImage's alpha raster. It is then drawn onto a destination image.

WritableRaster wr = colourImage.getAlphaRaster();

width and height are ints containing the width and height of the image.

The problem is, it seems to be scaling the shadeImage horizontally to several times its original width when it does so.

Anyone have any idea why?
Offline crystalsquid

Junior Devvie

... Boing ...

« Reply #1 - Posted 2004-09-21 19:22:22 »

At a guess, the shadeImage data is actually coming out as RGBA data with all the components the same (i.e. - grey) and alpha of 255. The data internally is actually expanded to 32bit data (maybe 24bit, Im not sure) - hence the 4x the width you expect, its reading 4 bytes per pixel and copying to a dest which uses 1 byte per pixel.
You should run through the data and write the bytes into the alpha raster by just reading a single component of the greyscale image (as the R = G = B for shades of grey.)

Hope this helps,

- Dom
Offline Walrus

Junior Newbie

Java games rock!

« Reply #2 - Posted 2004-09-22 16:58:30 »

That was the problem, it works fine now.

Thanks a lot.
Pages: [1]
  ignore  |  Print  
You cannot reply to this message, because it is very, very old.

Dwinin (73 views)
2015-11-07 13:29:08

Rems19 (81 views)
2015-10-31 01:36:56

Rems19 (79 views)
2015-10-31 01:32:37

williamwoles (107 views)
2015-10-23 10:42:59

williamwoles (93 views)
2015-10-23 10:42:45

Jervac_ (111 views)
2015-10-18 23:29:12

DarkCart (137 views)
2015-10-16 00:58:11

KaiHH (118 views)
2015-10-11 14:10:14

KaiHH (158 views)
2015-10-11 13:26:18

BurntPizza (173 views)
2015-10-08 03:11:46
Rendering resources
by Roquen
2015-11-13 14:37:59

Rendering resources
by Roquen
2015-11-13 14:36:58

Math: Resources
by Roquen
2015-10-22 07:46:10

Networking Resources
by Roquen
2015-10-16 07:12:30

Rendering resources
by Roquen
2015-10-15 07:40:48

Math: Inequality properties
by Roquen
2015-10-01 13:30:46

Math: Inequality properties
by Roquen
2015-09-30 16:06:05

HotSpot Options
by Roquen
2015-08-29 11:33:11 is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!