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Date Posted: 06:25:38 04/06/01 Fri
Author: Michel
Subject: Re: hylafax tiff images - wrong file height
In reply to: Timo Meier 's message, "Re: hylafax tiff images - wrong file height" on 10:49:17 04/05/01 Thu


Hi Timo,

The following transform class handles low resolution fax images:

Best regards,

Michel

{ Transform to expand low resolution Tiff fax files }
unit LowResFax;

interface

uses
EnDiGrph, { for TDibGraphic }
EnTransf; { for TImageTransform }

type

{ faxes can be transmitted in "low resolution" mode, where every second
horizontal line is skipped. The transform restores a low resolution
fax image. }
TLowResFaxTransform = class(TImageTransform)
public
procedure ApplyOnDest( const Source : TDibGraphic;
const Dest : TDibGraphic ); override;
end;

{--------------------------------------------------------------------------}

implementation

uses
EnMisc; { for DoProgress }

procedure TLowResFaxTransform.ApplyOnDest(
const Source : TDibGraphic;
const Dest : TDibGraphic );
var
LineNo : Integer;
DestLineNo : Integer;
begin
FLastPercent := -1;
FLastPercent := DoProgress(Self, FOnProgress, 0, 0, 100, FLastPercent);

Dest.NewImage( Source.Width, Source.Height * 2, Source.ImageFormat,
Source.PalettePtr, Source.XDotsPerInch, Source.YDotsPerInch );

LineNo := 0;

while LineNo < (Source.Height-1) do
begin
DestLineNo := LineNo * 2;

Move( Source.ScanLine[LineNo]^, Dest.ScanLine[DestLineNo]^, Source.ScanLineSize );
Move( Source.ScanLine[LineNo]^, Dest.ScanLine[DestLineNo + 1]^, Source.ScanLineSize );

Inc(LineNo);

FLastPercent := DoProgress(Self, FOnProgress, LineNo, 0, Source.Height-1, FLastPercent);
end;

FLastPercent := DoProgress(Self, FOnProgress, 100, 0, 100, FLastPercent);

end;

end.


>Paint Shop Pro has the same problem.
>Could you please mail me the program?
>
>Thanx
>
>Timo
>>
>>Hi Sven,
>>
>>Is the image compressed at half its height? Some fax
>>images are low resolution and skip every second
>>horizontal line. I have created a transform to restore
>>those images. Check the XDotsPerInch/YDotsPerInch
>>property after loading the tiff file. You may email me
>>the file and I will check if this is the situation.
>>
>>Best regards,
>>
>>Michel
>>
>>
>>>Hi!
>>>
>>>We use the latest envision lib (which we even
>>>registered)
>>>
>>>We detected the following error: When loading .tif
>>>files created by hylafax, we often get the wrong
>>>height - so the image looks streched.
>>>This happens with about 80% of all .tif files we
>>>tested.
>>>after resizing the file by hand to the right size, it
>>>looks correct again!
>>>
>>>email me to get an example .tif file, so you can test
>>>yourself.
>>>
>>>thanks
>>>sven
>>>
>>>btw: the faster you fix this error, the better -
>since
>>>we are working on a REALLY good hylafax client
>>>(database driven / multi user / multi line / inbox
>>>rules / outlook look'n'feel) and the tif viewer is an
>>>important component for that of course !

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