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Date Posted: 17:41:49 05/31/01 Thu
Author: Michel
Subject: Re: How save BW image as JPEG?
In reply to: Ann Weaver 's message, "How save BW image as JPEG?" on 15:31:24 05/31/01 Thu


Hi Ann,

The TJpegGraphic will allow saving images that have an image format of ifTrueColor or ifGray256.

I would first convert you image to ifGray256, using the TImageFormatTransform class. There is an example of this in the DemoForm.Pas unit, FormatConversionMenuClick event handler. Then you will be able to save it as a JPG.

Saving BW images in JPG is generally not a good idea though. JPG is optimized to compress color images, and slightly degrades the quality. For BW images, you would get better compression with Tiff group IV compression, and there is no quality loss.

Best regards,

Michel



>I have an application that acquires images from a
>scanner in Black & White and then detects a barcode in
>the image. I then want to save the image to disk as a
>.jpg with a filename of the barcode result.
>
>I have to scan the image as BW for the barcode
>detection to work.
>
>Everything is working great with the exception that I
>cannot save a BW image to a .jpg. I can save to a
>Bitmap but I need .jpg. How can I convert the image
>so it can be saved as a .jpg?
>
>I am a registered user of the Envision library and am
>using the Pegasus SmartScan Xpress software to detect
>the barcode in the image.
>
>Can anyone provide any assistance?
>
>Thanks!
>Ann

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