Honeycomb pattern

G
Posted By
Grinder
Feb 19, 2004
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582
Replies
4
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Closed
My apologies if this is the inappropriate forum, or if it has been conspicuously answered elsewhere…

I am an amateur with a basic understanding of the workings of photoshop (version 6 in my case.) I have recently undertaken the restoration of a 25 year-old school picture that has been damaged by a vindictive cat. Much of the required strategy is known to me, but the scan has produced another complication.

The texture of the print has a fine honeycomb pattern to it, that has resulted in a corresponding variation in the image’s intensity. (The scan was made at 1200 dpi, and the grid in which this hexagonal pattern appears is approximately 20 pixels across.)

Can someone suggest, or direct me to, a method of reducing this pattern? Thanks for your time and consideration.
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N
newsgroup
Feb 19, 2004
"Grinder" wrote in message
My apologies if this is the inappropriate forum, or if it has been conspicuously answered elsewhere…

I am an amateur with a basic understanding of the workings of photoshop (version 6 in my case.) I have recently undertaken the restoration of a
25
year-old school picture that has been damaged by a vindictive cat. Much
of
the required strategy is known to me, but the scan has produced another complication.

The texture of the print has a fine honeycomb pattern to it, that has resulted in a corresponding variation in the image’s intensity. (The scan was made at 1200 dpi, and the grid in which this hexagonal pattern appears is approximately 20 pixels across.)

Can someone suggest, or direct me to, a method of reducing this pattern? Thanks for your time and consideration.

Here’s a shot in the dark. Assuming the pattern is also 20 pixels high it sounds like you may be able to cancel it out by doing a second scan at ninety degrees from the first scan, rotating it to overlay the original (line up the hexagons), then experiment with blend modes. ~Doc
LC
Larry CdeBaca
Feb 19, 2004
Certain brands of scanners have in their software a "Descreening Filter" with several levels.
My Epson 3200 has Newspaper (85 lpi), Magazine (133 lpi), Fime Prints (175 lpi).
I have used it on old portraits with great success.
From the Help:
Descreening Filter
Select this check box to remove moire patterns from scanned images. Note:
Descreening is available when the resolution is set from 50 to 600 dpi.

"Grinder" wrote in message
My apologies if this is the inappropriate forum, or if it has been conspicuously answered elsewhere…

I am an amateur with a basic understanding of the workings of photoshop (version 6 in my case.) I have recently undertaken the restoration of a
25
year-old school picture that has been damaged by a vindictive cat. Much
of
the required strategy is known to me, but the scan has produced another complication.

The texture of the print has a fine honeycomb pattern to it, that has resulted in a corresponding variation in the image’s intensity. (The scan was made at 1200 dpi, and the grid in which this hexagonal pattern appears is approximately 20 pixels across.)

Can someone suggest, or direct me to, a method of reducing this pattern? Thanks for your time and consideration.

D
Diane
Feb 19, 2004
Another guess, which has happened to me on occasion and caused momentary confusion. Since you scanned it at 1200 dpi what magnification are you viewing it at in PS? Look at it at 100% and see if the pattern is still there. Sometimes my monitor adds a pattern that’s not really there at lower magnifications.

D

"Grinder" wrote in message
My apologies if this is the inappropriate forum, or if it has been conspicuously answered elsewhere…

I am an amateur with a basic understanding of the workings of photoshop (version 6 in my case.) I have recently undertaken the restoration of a
25
year-old school picture that has been damaged by a vindictive cat. Much
of
the required strategy is known to me, but the scan has produced another complication.

The texture of the print has a fine honeycomb pattern to it, that has resulted in a corresponding variation in the image’s intensity. (The scan was made at 1200 dpi, and the grid in which this hexagonal pattern appears is approximately 20 pixels across.)

Can someone suggest, or direct me to, a method of reducing this pattern? Thanks for your time and consideration.

G
Grinder
Feb 19, 2004
"Diane" wrote in message
Another guess, which has happened to me on occasion and caused momentary confusion. Since you scanned it at 1200 dpi what magnification are you viewing it at in PS? Look at it at 100% and see if the pattern is still there. Sometimes my monitor adds a pattern that’s not really there at
lower
magnifications.

Thanks for the thought, but the pattern is definitely there. It’s visible at 100% (and mostly disappears once your view gets smaller than 12.5%) and is even visible on the source that was scanned to create the image.

At first I thought it was simply a surface texture to give the image a satin sort of look, but upon closer inspection, I suspect it may actually be the matrix used to apply the pigment. Individual "cells" have ruptured in some places, causing a color shift, and for adjacent cells, some lesser discoloration.

Also, I can remove the honeycomb by applying a median (with a radius a bit less than half of the cell size,) but would prefer something less destructive to the image details.

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