Compression of pictures


JaOl
Visitor
Posts: 4
Joined: Thu Sep 03, 2009 9:11 pm
Scanner: Reflecta Crystalscan 7200
SilverFast Product: SE
SilverFast Version: 6.6

Compression of pictures

Postby JaOl » Thu Sep 03, 2009 9:35 pm

I´ve noticed a peculiarity with my scans with Reflecta Crystalscan 7200 and Silverfast. The scans are compressed slightly i the short, 24mm, direction. 1~2%. Is there a explication for this? And can I do something about it?

Jan

LSI_Luebker
SilverFast Master
SilverFast Master
Posts: 591
Joined: Mon May 07, 2007 9:43 am

Re: Compression of pictures

Postby LSI_Luebker » Mon Sep 07, 2009 1:01 pm

Dear Jan,

could you please tell what file format you are using ?
If you want to avoid compression at all I would suggest usinng tiff.
best regards,

Thomas Luebker,
LaserSoft Imaging AG

JaOl
Visitor
Posts: 4
Joined: Thu Sep 03, 2009 9:11 pm
Scanner: Reflecta Crystalscan 7200
SilverFast Product: SE
SilverFast Version: 6.6

Re: Compression of pictures

Postby JaOl » Mon Sep 14, 2009 10:24 pm

I do save in tif. It´s not that kind of compression. The scan i slightly elongated comparetd to the original slide.

LSI_Morales
SilverFast Master
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Posts: 1430
Joined: Mon Oct 22, 2007 9:33 am

Re: Compression of pictures

Postby LSI_Morales » Tue Sep 15, 2009 8:25 am

Dear JaOl,

perhaps you did a resizing of the output file or changed the scale values while the proportion locks where unlocked and this caused your files being different than the original slide.

Cheers
Alejandro Morales

LaserSoft Imaging
Media manager, Software testing

JaOl
Visitor
Posts: 4
Joined: Thu Sep 03, 2009 9:11 pm
Scanner: Reflecta Crystalscan 7200
SilverFast Product: SE
SilverFast Version: 6.6

Re: Compression of pictures

Postby JaOl » Mon Sep 28, 2009 8:54 pm

No, The scans is like that when they come in to Photoshop. But I have tried to scan with CyberView with exactly the same result so I think it´s a property of the scanner some how.

Jan

LSI_Morales
SilverFast Master
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Posts: 1430
Joined: Mon Oct 22, 2007 9:33 am

Re: Compression of pictures

Postby LSI_Morales » Tue Sep 29, 2009 7:46 am

Dear JaOl,

CyberView is the original scanner driver which is also used by SilverFast. If you mean this effect is also present there, most likely this is produced by the scanner. What I really wonder is: How are you able to perceive a 1% difference in an inch big negative?

Cheers
Alejandro Morales

LaserSoft Imaging
Media manager, Software testing

JaOl
Visitor
Posts: 4
Joined: Thu Sep 03, 2009 9:11 pm
Scanner: Reflecta Crystalscan 7200
SilverFast Product: SE
SilverFast Version: 6.6

Re: Compression of pictures

Postby JaOl » Mon Oct 05, 2009 9:37 pm

It´s slight but more than 1%. I scanned a 24 x 24 slide and turned it around 90 degrees and did a new scan and mesured with the ruler in Photoshop. I also superinposed the pictures.
I actually noticed this first when I compared a inkjetprint with a C-print.

Cheers Jan

LSI_Morales
SilverFast Master
SilverFast Master
Posts: 1430
Joined: Mon Oct 22, 2007 9:33 am

Re: Compression of pictures

Postby LSI_Morales » Tue Oct 06, 2009 7:57 am

Dear jan,

Since you have perceived the same effect using Cyberview, most likely the cause for this lies directly in the driver or the scanner itself.

Thanks for reporting, we will have it in mind next time we test the scanner.

Cheers
Alejandro Morales

LaserSoft Imaging
Media manager, Software testing


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