Hello all,

I am going through the basic tutorials of allegro 5, so to change the display color there is function al_clear_to_display(), which takes the argument al_map_rgb(0,0,0).

In the Tutorial it is well explained that 0,0,0 are the values of RED, GREEN & BLUE . So in that case if we change r,g,b values we should have a change of colour in the display.

But that is not happening when I try with different values. The display remains Black irrespective of the values(r,g,b).

Any reason for this problem?

You can find the code at "http://wiki.allegro.cc/index.php?title=Allegro_5_Tutorial/Displays"

Thank you.

Have you flipped the display after clearing the screen?

Edgar: given he's changed it, there no guarantee that's still there.

With which values are you trying? those are int values ranging from 0 to 255.

just sayin'

Edgar & Thomas : Yes I had flipped the dispaly

pkrcel : I gave inputs like (2,5,5)&(28,32,56)

Does that problem any thing to do with, static and dynamic linking?

The first set of values will give a colour that is most likely indistinguishable from black. The second set should definitely be noticeably different though.

No.

Post the full final code that exhibits the problem.

Oh! Brilliant , that worked for even higher values than what I mentioned .

White = 255,255,255

Any values below 48 are going to be difficult to notice, especially if there's no comparison.

There's also floating-point versions of the map_rgb commands that take values from 0.0 to 1.0 instead of 0 to 255.

to me also the 2nd set of values gives a color VEEEERY close to black.

please try with something like magenta (255, 0, 255) and tell us what you get, please.

EDIT: missed that it was already sorted.....well CVD.

It could be your monitor settings. When I ran it, there was a console window behind that was black so the difference was pretty clear.

{"name":"brightness_contrast_setting.png","src":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/a\/c\/ac68cc994b8fdb9bfabe20ad908132fc.png","w":720,"h":540,"tn":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/a\/c\/ac68cc994b8fdb9bfabe20ad908132fc"}