OpenEuphoria

2. Re: Beginner with another doubt

• Posted by Ralf Nieuwenhuijsen <nieuwen at POP.XS4ALL.NL> Jul 09, 1997
• 641 views
• Last edited Jul 10, 1997

>  I'd like to know how are the maximum number of colors suported by
> Euphoria.

        View the file 'graphics.e'
        It is in your euphoria\include directory

        There you will find information about all the different video
modes....
        Currently there is not a video mode that is supported by Euphoria
that has more than 256 colors.

        As a bit extra information to avoid next doubt or thinking in the
wrong direction (so asking the qrong questions) i wrote this here:

        You have several different video modes... all of them use the
pallete system (exception for Win95 that has its own video drivers
that allow color specification at each point)...
        Each point on the screen is made up of blue, red and yellow light.
        The power of each of those lights make every color possible.
(Remember learning at school painters make all colors with those
three by mixing them up)
        However because we want to refresh the screen more often we will
store all the screen data somewhere in memory (video memory) and just
use that data for each refresh..
        The monitors support 64 different levels of light intensity (power)
for each of the tree primaire colors (red, blue and yellow)
        So you would need 3 * 64 * horizontal resolution * vertical
resolution / 8 bytes (yep, this sounds complecated, just know that it
is A LOT)
        That would require an awfull lot of memory and makes updates
slower.. so what we do it we have a number of  custom different
combinations of red,green, blue intensity and we specify which of the
'color' should be used for each point on the screen...
        We store all those combinations on the palette (like a real painter
does) and use one of them for each point.
        The number of palette entries depends on the video mode.
        For example mode 19 (MCGA/VGA) has 256 entries.

        We use the same method in a BMP... we have a number of different
combinations (palette entries) and a block of image data saying
        which combination(stored in the palette) to use for each point
(pixel) on the bitmap.
        Like video modes, bitmaps also have different number of palette
entries.... you should save your files with the same number of
palette entries as the screen mode you want to display them on....

        You could also find part of this information in Micheal Packards
tutorials, there it is explained much more clear, because he's a PRO
and he can speak ENGLISH. (I learn it as school, but i don't feel
100% comfortable using it! Nor can i express my self like i am
possible in Dutch.)

        SO if i only made it more confusing for you, read his tutorials,
their good.

        BTW Wasn't the AI thing to be posted last night?
        Will you, Packard do me a favor and post BEFORE saterday, cause i am
going on a holiday sunday (to greche or whatever) , so instead of
anoying my stressed parents i could be behind my computer learning
your AI stuff... (please??)

        He if saw some1 saying it toke a couple of minutes to download the
chain letter...

        If so get another ISP and/or mail service.
        I donwloaded that + another couple of messages in about 6
seconds... (i can understand that your mad through)

        Ralf Nieuwenhuijsen
nieuwen at xs4all.nl