: 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

@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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