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Convert BGRAbitmap to 256 Color BMP and save
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Author
Topic: Convert BGRAbitmap to 256 Color BMP and save (Read 535 times)
winni
Hero Member
Posts: 3197
Convert BGRAbitmap to 256 Color BMP and save
«
on:
November 17, 2022, 02:08:35 pm »
Hi!
Question in the german forum:
How to convert BGRAbitmap to a 256 Color BMP and save it?
It is needed by some SAP software that rejects all images except 256-Color-BMP.
Is there a solution yet? I have not found anything.
Winni
Logged
paweld
Hero Member
Posts: 970
Re: Convert BGRAbitmap to 256 Color BMP and save
«
Reply #1 on:
November 17, 2022, 05:13:52 pm »
Hi,
sample code:
Code: Pascal
[Select]
[+]
[-]
uses
BGRABitmap
,
BGRABitmapTypes
,
BGRAColorQuantization
,
FPWriteBmp
;
procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
var
img
:
TBGRABitmap
;
bmpw
:
TFPWriterBmp
;
quant
:
TBGRAColorQuantizer
;
i
:
Integer
;
begin
img
:
=
TBGRABitmap
.
Create
(
'd:\wzor80.jpg'
)
;
bmpw
:
=
TFPWriterBmp
.
Create
;
bmpw
.
BitsPerPixel
:
=
8
;
//bmpw.RLECompress := True;
quant
:
=
TBGRAColorQuantizer
.
Create
(
img
,
acIgnore
,
256
)
;
//reduce color to 256 without alfa
quant
.
ApplyDitheringInplace
(
daNearestNeighbor
,
img
)
;
img
.
UsePalette
:
=
True
;
img
.
Palette
.
Clear
;
for
i
:
=
0
to
quant
.
ReducedPalette
.
Count
-
1
do
//copy reduced colors to palette
img
.
Palette
.
Add
(
quant
.
ReducedPalette
.
Color
[
i
]
.
ToFPColor
)
;
img
.
SaveToFile
(
'd:\wzor80_256color.bmp'
,
bmpw
)
;
//save as bmp
bmpw
.
Free
;
//clean
img
.
Free
;
quant
.
Free
;
end
;
Logged
Best regards / Pozdrawiam
paweld
winni
Hero Member
Posts: 3197
Re: Convert BGRAbitmap to 256 Color BMP and save
«
Reply #2 on:
November 17, 2022, 05:37:06 pm »
Hi!
Thanx a lot.
The Quantizer was the part that I forgot. Getting old ...
The Link in the german forum:
https://www.lazarusforum.de/viewtopic.php?f=18&t=14593&p=131460#p131460
Winni
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Convert BGRAbitmap to 256 Color BMP and save
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