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Ann6370331

: How can I reduce compression artifacts in dark areas with Photoshop? Using Photoshop I have converted a photograph into a sketch/line drawing, I achieved this in photoshop by: Making image greyscale

@Ann6370331

Posted in: #AdobePhotoshop #Drawing #Effects #LineArt #PhotoshopEffects

Using Photoshop I have converted a photograph into a sketch/line drawing, I achieved this in photoshop by:


Making image greyscale
Duplicating image then inverting it
Applying a color(colour) dodge
Applying a gaussian blur (level 8)


Here is the effect, as you can see there are undesired effects on the cats face, where the fur is dark, I've discovered that because the area is not all pure black, and different variations of black.

How can I fix the image before applying the effects to prevent such artefacts from accruing?

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@Lengel450

Making image greyscale
Duplicating image then inverting it
Applying a color(colour) dodge
Applying a Box blur (level 16)
Add Noise and/or Remove Noise to the bottom Layer


Then you'll need to paint a little. Use overlay brushes, a Flow of around 10% and painting in black and white. You can easily paint over the remaining artifacts making them darker / lighter until they are invisible. Result:

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@Deb5748823

You can try to use the Reduce Noise filter in Photoshop on the original image.
So the steps for you would be then:


Convert image to B&W (Layer 1)
Duplicate the image, then invert it (this is Layer 2)
Set the layer blending mode of Layer 2 to Colour Dodge.
Apply a Gaussian Blur to Layer 2.
Select Layer 1, go to Filter -> Noise -> Reduce Noise. You'll get the following window:

Now tweak the parameters of this filter such that the noise is minimised. Don't forget to check the Remove JPEG Artifact option.

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