Colortrac Flatbed 24120 Specifications download pdf (Page 8)

Colortrac 24120 Product Sales Guide 6

3.2 Depth of Field

One of the exciting aspects of the Flatbed 24120 is the large depth of field that the new scanner

has. This can be useful for scanning objects that have depth, in other words 3-D objects. For

example heavily textured oil or acrylic based paintings and regular 3-D objects can be scanned

without problem. Object focus will start to be lost when the object approaches or exceeds the

scanner’s depth of field but this is true for any optical system. There will also be problems in the

camera-to-camera stitch boundary area where the scanned image will start to overlap itself as

the object moves further away from the normal stitch/focus point. This is normal for any multiple

camera scanning device.

3.3 Variable object distance:

3-D objects that have heavy irregular relief need to be less than 915 mm x 300 mm (36” x 12”).

In other words they should be scanned using only one camera. Larger 3-D objects that cover

both cameras can be scanned but they may suffer optical errors. The ‘Cut Overlap’ Scanworks

enhancement for flatbed will NOT work in these cases because this is a tool designed for images

which have a constant image overlap error – the result of scanning a flat target a constant

distance from the glass. Objects where the focal distance is continually changing like watches,

circuit boards, geographical relief models and so on can be scanned successfully using one side

of the scanner.

3.4 Fixed object distance:

Objects that present a constant offset from the scanner glass, for example a framed picture, will

produce an image repeat or overlap along the centre-line of the scanner. Such images can be

reworked using the special Cut-Overlap software tool in Scanworks. These and other off-the-

glass scans present no problem as long as the height of the image from the scan glass is

constant and does not exceed approximately 6mm.

Scan objects that are flat but larger than A1 can be rebuilt from several smaller scans using the

Join Images tool now included in Scanworks. See Section 5 later in this document for more

information on how this command is used.

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Colortrac Flatbed 24120 Specifications Page 8