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You have discovered a very common bottleneck in digital
imaging workflows and your quest for guidelines is to be
applauded. It is important to help your staff understand the
requirements of the quality control step, where it fits into the overall
workflow and how to avoid becoming a bottleneck in the
production.
First, define what quality is acceptable in as many
areas as you can think of. Here are a few examples from a typical slide
scanning workflow. There are more, and probably some that are particular
to your particular situation, but this will give you an
idea.
-Color, density, contrast and saturation should be
close to the slide, or an improvement on the slide;
-Scan should be in focus;
-No dust when viewed at 25%;
-Proper filename.
As you can see, the word "perfect" isn't in
there.
After defining the
quality level desired, and reviewing your hardware and softare, you can develop
an efficient QC routine.
Our QC people use a fast image browser (usually Thumbs
Plus Pro 7 from Cerious Software) and a calibrated monitor. They use
Thumbs to generate JPEG derivatives, and QC those instead of spending hours
looking at each big TIFF file. If the derivatives are done correctly,
everything you need to know about the TIFF can be seen there. After Thumbs
has generated the JPEGS for several hundred scans, they use the slide show
function (set to manual advance) to go through them. If scans look
questionable in any way, they compare the slide (on a color balanced light box
matching the monitor), to the image in Thumbs. Thumbs is set to show the
filename on the screen along with a full-screen image. It only takes 5
seconds for an experienced technician to QC each scan this
way.
One thing that will save a lot of time is assigning
filenames in a consecutive manner so the slides can be viewed in the same order
as the scans. If the filenames are not consecutive, a trick is to put (or
leave if its already there), a consecutive number followed by an underscore,
before the rest of the filename. This way the scans, as well as the JPEGS,
will sort in the same order as the slides. It only takes a few seconds to
eliminate that filename prefix later using a bulk utility (like "Bulk Filename
Utility").
Good luck!
Howard Brainen
Digital Imaging Consultant
TWO CAT DIGITAL
INC.
14719 Catalina Street
San Leandro, CA 94577
USA
510-940-2670 x201
Greetings:
Please excuse cross posting.
Do any of you have guidelines created
for individuals who perform digital image quality control that you are
willing to share? I have a staff member who performs such work and is a
self described "perfectionist." As a result I am trying to set some
guidelines that will result in a reasonable and appropriate amount of time spent
on quality control.
In addition to guidelines, any documentation
outlining the "how-to" (if this information is separate from the guidelines),
the processes you include under the umbrella of "quality control," and any
statistics you have compiled related to this aspect of your work
flow would also be appreciated.
Thank you,
/Elizabeth Schaub, Director
Visual Resources Collection
School of Architecture
The University of Texas at Austin
512.471.5003
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