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POHow can I scan a 300dpi image and save in TIFF format using Delphi?
 

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  1. POHow can I scan a 300dpi image and save in TIFF format using Delphi?
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    <p>I'm using Delphitwain (delphitwain.sourceforge.net) to add scan functionality to my app. Scanning is working fine and I can save bmp and jpeg files. Now I need to:</p> <ul> <li>save in 300dpi (the scanner is capable)</li> <li>save in TIFF format</li> </ul> <p>After digging around, I found 2 tips:</p> <p><a href="http://www.delphipraxis.net/132787-farbstich-nach-bitmap-operation.html" rel="nofollow">http://www.delphipraxis.net/132787-farbstich-nach-bitmap-operation.html</a></p> <p><a href="http://synopse.info/fossil/wiki?name=GDI%2B" rel="nofollow">http://synopse.info/fossil/wiki?name=GDI%2B</a></p> <p>Here is my final code:</p> <pre><code>procedure TForm1.GoAcquireClick(Sender: TObject); begin Counter := 0; Twain.SourceManagerLoaded := TRUE; Twain.LoadSourceManager; Twain.TransferMode := ttmMemory; with Twain.Source[ 0 ] do begin Loaded := TRUE; SetIXResolution(300); SetIYResolution(300); SetIBitDepth(1); EnableSource(true, true); while Enabled do Application.ProcessMessages; end; end; procedure TForm1.TwainTwainAcquire(Sender: TObject; const Index: Integer; Image: TBitmap; var Cancel: Boolean); var TiffHolder: TSynPicture; begin Inc( Counter ); Current := Counter; ImageHolder.Picture.Assign( Image ); ImageHolder.Picture.Bitmap.Monochrome := true; ImageHolder.Picture.Bitmap.Pixelformat := pf1Bit; SynGDIPlus.SaveAs(ImageHolder.Picture, format('c:\temp\teste%d.tif',[ Counter ]), gptTIF ); end; </code></pre> <p>Result: the image still is 96dpi and were saved as BMP (even with TIF extension).</p> <p>What am I missing?</p>
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      1. POHow can I scan a 300dpi image and save in TIFF format using Delphi?
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    1. COGreat question. Please post your Delphi version. I would suggest you change the subject to how to change the DPI from 96 to 300.
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    2. COrelated: http://stackoverflow.com/questions/2059343/twain-scanning-components-for-delphi (not a duplicate because this new question boils down to how to change the DPI and file-format on the scan using these same Twain components, probably a property setup issue)
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      1. POHow can I scan a 300dpi image and save in TIFF format using Delphi?
      1. USWarren P
    3. COThanks for your tip Warren. I would keep the word "scan" instead of "change resolution" because I don´t know if the acquired image is already in 300dpi or it was changed after I manipulated it on Image parameter.
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