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"Maps, Air Photo & Geospatial Systems Forum" <[log in to unmask]>
Subject:
scanning specifications
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Maps-L Moderator <[log in to unmask]>
Date:
Mon, 4 May 2009 15:04:42 -0500
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-------- Original Message --------
Subject:        scanning specifications
Date:   Mon, 4 May 2009 15:54:46 -0400
From:   Boardman, Richard <[log in to unmask]>
To:     <[log in to unmask]>



Hello,

We’re having a conversation here about scanning color maps from our
collection of Philadelphia real estate atlases. Each plate is usually a
two-page spread, measuring about 20” x 28”. They have been scanned at
300dpi, 24-bit color but some are now advocating going to 48-bit color.
Others maintain that this would produce a huge, almost unusable file.

What are the pros and cons of 24 vs 48-bit color scanning? Is anyone
doing anything at that level? How is it working out?

Thanks.

Rich Boardman

Map Collection

Free Library of Philadelphia

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