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Date Posted: 04:28:18 11/09/01 Fri
Author: Brett
Subject: Re: BMP to Transparent PNG for IE
In reply to: Michel 's message, "Re: BMP to Transparent PNG for IE" on 17:46:23 11/08/01 Thu

My appolgises for not noticing the related threads in the archives before posting. I have used one of them to progress. Unfortunately I get a error on saving:

'Invalid number of transparent colors specified'

gGraphic2 := TPNGGraphic.Create;
gGraphic2.SaveProgressive := True;
gGraphic2.SaveTransparent := True;
gGraphic2.LoadFromFile( 'c:\tbbn3p08[1].png' );
gGraphic2.SaveTransparent := True;
gGraphic2.SaveProgressive := True;
gGraphic2.Transparent := True;
gGraphic2.TransparentColor := gGraphic.RGB[ 0, 0 ];
gGraphic2.SaveToFile( 'c:\tbbn3p08[1]10.png' );
gGraphic2.Free;


>
>Hi Brett,
>
>Have a look at the BackgroundColor, TransparentColor,
>SaveTransparent, and SaveWithBackground properties in
>the online help. You will need to set SaveTransparent
>and TransparentColor before saving.
>
>The demo program does not specify a background color
>so the background may be black when loading images.
>
>Best regards,
>
>Michel
>
>
>>I am trying to convert a BMP to PNG and then set the
>>background to be transparent so that it appears
>>transparent in IE.
>>
>>Even when loading a transparent png from and then
>>saving it immediately removes the transparency.
>>
>> gGraphic.LoadFromFile( 'c:\tbbn3p08[1].png' );
>> gGraphic.Transparent := True;
>> gGraphic.SaveToFile( 'c:\tbbn3p08[1]2.png' );
>> fs := TFileStream.Create( 'c:\tbbn3p08[1]5.png',
>>fmCreate );
>> gGraphic.SaveToStream( fs );
>>
>>The demo application supplied with the library does
>>not seem to load transparent PNGs, it fills in the
>>background with black

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