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Old 02-25-2012, 04:05 PM
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NRC NRC is offline
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Converting an image to threshold

Hello everyone,

I often use Photoshop's threshold filter to convert an image to black and white shapes. It helps me with composition and determining balance / weight. However, I do this with Photoshop's default setting (on my computer) of 128. How does one determine the correct setting (128 vs 150 or 175, etc)?

I'm a fixer-upper. I like the puzzle of it all. I like to get myself into trouble and try to work my way out of it. I'm never going to run out of substandard stuff. Robert Genn

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Old 02-25-2012, 04:25 PM
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arnoud3272 arnoud3272 is offline
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Re: Converting an image to threshold

Hi, Nell -
I've moved your question to a forum where you have more chance to get a good answer
C&C welcome.

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Old 02-26-2012, 10:40 AM
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wsrea wsrea is offline
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Re: Converting an image to threshold

Nell, I don't think there is a "correct" setting. I have PS Elements instead of PS, but the threshold filter works the same (I think).

When you pull up the threshold filter, one of the options is to click the "preview" box. Think of the threshold filter as a conversion to black and white: the setting is such that any pixel with a value (in this case "lightness") greater than the threshold setting is converted to white. Any pixel with a lightness value smaller than the setting is converted to black.

On the bottom of the filter histogram is a slider. The further left you move it, the greater proportion of white-to-black in your image; the further right, vice versa. You can use the slider to get a black/white image that pleases you. It essentially makes a notan image.

Frankly, I use the posterize filter more: convert a copy of your image to grayscale and then posterize to, say a setting of 6. This gives you a six-value represntation of your image. I most often use 4 as the setting on the posterize filter, again for composition.

Hope this was useful and responsive.


Comments and critiques are invited
website: www.williamrea.com

Last edited by wsrea : 02-26-2012 at 10:46 AM.

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