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#1
natcase

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Is there a way to select specific ranges of 16-bit grayscale values, for example in a DEM-based TIFF? Photoshop's controls only fine-tune down to 256 levels....

Nat Case
INCase, LLC

Minneapolis, Minnesota USA
maphead.blogspot.com



#2
Nick Springer

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Use Select > Color Range
Dial back the "Fuzziness" to 0
Use the eyedropper on your image to select one end of your range
Change to the Eyedropper with the Plus sign and sample the end of your range

You can use the info palette to make sure the eyedropper is over the correct color value.

Nick Springer

Director of Design and Web Applications: ALK Technologies Inc.
Owner: Springer Cartographics LLC


#3
natcase

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Use Select > Color Range
Dial back the "Fuzziness" to 0
Use the eyedropper on your image to select one end of your range
Change to the Eyedropper with the Plus sign and sample the end of your range

You can use the info palette to make sure the eyedropper is over the correct color value.

<{POST_SNAPBACK}>


Has potential, but is there a way to do it numerically?

Nat Case
INCase, LLC

Minneapolis, Minnesota USA
maphead.blogspot.com



#4
Nick Springer

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You can set the foreground and background color swatches in the main toolbar to be the values you want numerically and then I think you can use the eydropper tool on the swatches when you are in Select Color Range.

You can also sample colors from other open documents, so if the above doesn't work you could creat a dummy document with 2 "swatches" of the start and end tones, and have it side by side with the DEM.

Nick Springer

Director of Design and Web Applications: ALK Technologies Inc.
Owner: Springer Cartographics LLC


#5
natcase

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You can set the foreground and background color swatches in the main toolbar to be the values you want numerically and then I think you can use the eydropper tool on the swatches when you are in Select Color Range.

You can also sample colors from other open documents, so if the above doesn't work you could creat a dummy document with 2 "swatches" of the start and end tones, and have it side by side with the DEM.

<{POST_SNAPBACK}>


I think your first idea is the answer. I'm looking, for example, at cleanTOPO2, which is packaged as a 16-bit grayscale TIF, with each elevation level as a grayscale step... I want to create hypsometric tints using exact numeric breaks, so I think the foreground-as-placeholder is the trick. Muchas gracias!

Nat Case
INCase, LLC

Minneapolis, Minnesota USA
maphead.blogspot.com






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