The discussion below seems to confirm what we say in section 4.3
of the imode-faq: you should not trust the imode-simulators too much!
You can find section 4.3 here:
http://www.eurotechnology.com/imode/faq-dev.html
Best regards,
Gerhard Fasol
http://www.eurotechnology.com
Ben Hutchings wrote:
>
> Jørn Are Sjulsen wrote:
>
> > according to
> > http://www.eurotechnology.com/imode/faq-handsets.html, the new
> > java enabled phones all have 256 color screens, but running a small test
> > program i wrote on the i-jade emulator, gives me somewhat
> > different results.
> > (a screenshot can be found at: http://www.uio.no/~jornas/testshot.jpg).
> >
> > the test program loads up 3 gif's, all with different pallettes, draws a
> > portion of each to the screen, and then, using the
> > Graphics.getColorOfRGB()
> > method, draws one red gradient, one green gradient, and one blue gradient.
> > the result is that all pictures show up just fine, while the gradients all
> > seem to be using a fixed 332 rgb pallette, making them look very bad.
> >
> > is all this because the i-jade simulator does something weird, or can the
> > phones change pallette between drawing operations? in the latter case, is
> > there a limit to how many different colors that can actually be shown
> > onscreen at the same time?
> <snip>
>
> A palette (or CLUT, Colour Look-Up Table) defines how the values stored
> in memory for each pixel are translated into colours. Changing the
> palette changes the colours on-screen (soon) since the screen doesn't
> remember its state and must be refreshed from memory. Unless it's
> possible to change the palette as the screen is being refreshed (a rare
> feature, and one that I think a general drawing facility could not make
> use of), then the palette limits how many colours you can have on-
> screen.
>
> I think that the simulator just doesn't modify images to reflect the
> phones' display limitations at the moment. This is quite separate
> from modifying the colours you select for drawing operations.
>
> (There are somewhat similar problems with some video drivers for
> Windows that use different algorithms to select best colours for pens
> and for bitmap images, which can cause colour mismatches in web pages
> - even if they use the "web-safe" colours.)
>
> --
> I do not speak for Roundpoint; any opinions I express are my own.
>
> [ Did you check the archives? http://www.appelsiini.net/keitai-l/ ]
[ Did you check the archives? http://www.appelsiini.net/keitai-l/ ]
Received on Tue Feb 20 22:01:39 2001
