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Date Posted: 19:21:39 05/31/01 Thu
Subject: Re: How save BW image as JPEG?
In reply to:
's message, "Re: How save BW image as JPEG?" on 18:00:57 05/31/01 Thu
The best thing is to try it out. If the quality and image size is acceptable, .jpg will be the most versatile to display on the web. The only other option, is png, which is now supported on most browser. You would get better quality and compression with png.
>I realize this is not necessarily a good idea but the
>images we are scanning here need to be in a format
>that can be accessed via a web interface. The customer
>specifically requested the .jpg format. Basically
>these are black and white documents with signatures
>that are being scanned for historical reasons
>(eliminating a paper trail that is hard to go back and
>find for proof of signature). The barcode on the
>document is a number that is being used in a different
>system for tracking purposes against clients. When
>there is a dispute they want to be able to lookup that
>number and then go into this system to reference the
>image of the original document and be able to
>print/fax the copy as proof of the transaction. They
>don't want to have to sift through paper documents
>unless they have to.
>Is there a better format that I should be trying to
>convince them to use? TIFF is out as they already said
>that was a definite NO. They opted for JPEG for it's
>versatility. Image quality is not that important as
>long as the document is readable. Although better
>quality is good of course.
>Thanks for your help. I will give that a try tonight
>to see how that works out.
>>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.
>>>I have an application that acquires images from a
>>>scanner in Black & White and then detects a barcode
>>>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?
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