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Date Posted: 17:51:49 10/15/01 Mon
Author: Michel
Subject: Re: incorrect values in a colormap
In reply to: Heiko 's message, "Re: incorrect values in a colormap" on 04:20:25 10/15/01 Mon


Best regards,


>Hello Michel,
>many thanks for your check of the problem with the
>Unfortunately I can't modify the EnTifGr.Pas, because
>at the time I use still the trial version 1.1. I think
>I will buy the complete version in the next time.
>Please send me a corrected EnTifGr.dcu so long.
>My emailadress: heikoe@freenet.de
>Thanks in advance
>>Hi Heiko,
>>I have found and corrected the problem.
>>In EnTifGr.Pas,
>>the function Cvt becomes:
>>function Cvt( Value : Word ) : Byte;
>> Result := (((Value) * LongInt(256)) div ((1 shl
>>and in SetTiffPalette, 255 is replaced by 256:
>>{ a 16 bit palette is more common for TIFF, so
>>multiple each entry by 255. }
>>pBlueColorMap^[PaletteIndex] :=
>> Palette.palPalEntry[PaletteIndex].peBlue*256;
>>pGreenColorMap^[PaletteIndex] :=
>> Palette.palPalEntry[PaletteIndex].peGreen*256;
>>pRedColorMap^[PaletteIndex] :=
>> Palette.palPalEntry[PaletteIndex].peRed*256;
>>Best regards,
>>>Hello Michel,
>>>thank you for the response to my question 'Convert 4
>>>bit to 16bit Tif'. It works now!
>>>But i have a new problem. Itīs importend for me, that
>>>the colors in my images have exactly values.
>>>I define the RGB values with the 'tagPALETTEENTRY'
>>>e.g. newtifgraphic.PalettePtr^.palPalEntry[n].peRed
>>>newtifgraphic is a TTIFFGraphic. I repeat this for
>>>each colorvalue in each color in my colormap and save
>>>the TIFFGraphic. And now, when I reload the graphic
>>>all values are reduced by 1. Only the value 0 is
>>>correct. The result of the line above is 84.
>>>I can't increase the value by 1, because I need often
>>>the value 255 and the value 256 isn't valid in a Byte
>>>Have you an idea?
>>>Many thanks

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