ADLINK Technology PCI-MPG24 Manuel d'utilisateur télécharger pdf (Page 148)

138 Reference Manual

In the previous equations, X

is the source data (Y or U or V), X

the result (Y or U or V),

α is the alpha blending level which is

defined in bit 2 to bit 0. C

is the background color and C

is the

foreground color. As there are three channels (YUV), C

and C

could be programmable from C-Bus for every channel.

So there are two ways to change the OSD color:

1. Change the YUV value in Fix_setting.txt

// osd setting

osdcfg.DoOSD = 1

osdcfg.OSDyc0 = 0

osdcfg.OSDyc1 = 255

osdcfg.OSDuc0 = 0

osdcfg.OSDuc1 = 128

osdcfg.OSDvc0 = 0

osdcfg.OSDvc1 = 128

2. Change the alpha blending level (a) as the above algorithm def-

inition.

Refer the following YUV to RGB converting algorithm for detail.

Y = 0.299R + 0.587G + 0.114B

U = - 0.147R- 0.289G + 0.436B

V = 0.615R - 0.515G - 0.100B

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ADLINK Technology PCI-MPG24 Manuel d'utilisateur Page 148