[fpc-devel] Correlation between TFPColor and RGB values (possible inconsistencies)

[Luiz Americo Pereira Camara]

Mattias Gaertner escreveu:
> On Tue, 16 Feb 2010 17:15:37 -0300
> Luiz Americo Pereira Camara <luizmed at oi.com.br> wrote:
>
>   
>> or
>>
>> colGray be redefined as colGray       : TFPColor = (Red: $8080; Green: 
>> $8080; Blue: $8080; Alpha: alphaOpaque) ??
>>     
>
> Yes, although this rarely makes a difference.
>   

It does.
See below.

>  
>   
>> This info will help to fix http://bugs.freepascal.org/view.php?id=15793
>>     
>
> IMO the bug report is misleading. Converting a TFPColor to RGB looses
> bits. 

The bug is not about converting to RGB. See the attached example in 
bugreport.

  SetCol := colGray;
  Img.Colors[0,0] := SetCol;
  GetCol := Img.Colors[0,0];

  SetCol <> GetCol

Luiz