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Date Posted: 11:57:15 04/08/00 Sat
Author: Michel
Subject: Re: Capturing Images from Digital Camera and Thumbnails
In reply to: John Newell 's message, "Capturing Images from Digital Camera" on 06:18:21 04/08/00 Sat


Hi John,

If your camera has a twain driver it should be fine. I've tested the library with a Kodak DC215 with and without the twain driver's user interface.

For thumbnails, you'll need to do a bit of work with the TResizeTransform, but it is quite simple. Here is a code snippet to generate thumbnails:

var
SmallJpg : TJpegGraphic;
BigJpg : TJpegGraphic;
ResizeTransform : TResizeTranform;

begin
SmallJpg := TJpegGraphic.Create;
BigJpg := TJpegGraphic.Create;
ResizeTranform := TResizeTransform.Create;

for each jpeg file { replace with your loop }
begin
BigJpg.LoadFromFile(FileName);

ResizeTransform.Width := 80;
ResizeTransform.Height := 80;
ResizeTransform.ApplyOnDest( BigJpg, SmallJpg );
SmallJpg.SaveToFile( ... );
end;

ResizeTransform.Free;
BigJpg.Free;
SmallJpg.Free;
end;

You may also want to use the Interpolated property of the TResizeTransform for better quality thumbnails.

Best regards,

Michel

> I am just starting a project where I need to capture
> photogrpahic images from a digital camera directly
> into my application. I need TWAIN support, image
> viewing, the ability to automatically convert captured
> images into thumbnails for easy viewing and browsing,
> simple image manipulation and touchup. It looks like
> Envision will do most of this. In your list of
> features you state TWAIN scanning...I am assuming this
> will handle from a digital camera as well? How about
> auto converting images to thumbnails?
> Thank you. John.

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