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Date Posted: 17:35:21 06/20/02 Thu
Author: Michel
Subject: Re: Converting tiff to jpg
In reply to: Tommy Baitz 's message, "Re: Converting tiff to jpg" on 15:37:02 06/20/02 Thu


Hi Tommy,

Have you tried leaving the destination as True color? Is the original true color or black and white. I have done a similar application, where instead of returning a JPEG I return a PNG to the browser, and I use the new anti-alias transform in version 2 which resize faster.

Best regards,

Michel

>Thanks for the idea. It does indeed speed up the
>conversion but Im afraid the quality is too poor.
>>
>>Hi Tommy,
>>
>>For speed, set Interpolated := False and make the
>>destination image format true color. JPEG compresses
>>well with true color, so there will be no need to
>>"palettize" the image. On the web with JPEG images the
>>quality may be acceptable.
>>
>>Best regards,
>>
>>Michel
>>
>>>Hi,
>>>
>>>I have written an ISAPI dll to convert tif to jpg on
>>>the fly so that the browser can display the image. I
>>>basically use the following code. Everything works
>>>perfectly except for one thing of course. That is
>>>speed. The TResizeTransform takes a long time. Is
>>>there any way to speed it up?
>>>
>>>The MemStream has the image in it.
>>>
>>> tif := TTiffGraphic.Create;
>>> MemStream.Position := 0;
>>> try
>>> tif.LoadFromStream(MemStream);
>>> except
>>> ErrFlag := true;
>>> end;
>>>
>>> with TResizeTransform.Create do
>>> try
>>> Width := 400;
>>> Height := 550;
>>> DestFormat := ifGray256;
>>> OverrideDestFormat := true;
>>> Interpolated := true;
>>> Apply(tif);
>>> finally
>>> Free;
>>> end;
>>>
>>> with TJpegGraphic.Create do
>>> try
>>> SaveQuality := 80;
>>> SaveProgressive := true;
>>> Assign(tif);
>>> SaveToStream(MemStream);
>>> finally
>>> Free;
>>> end;
>>> tif.Free;

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