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I need to make the same curve as the picture from scratch in PS, using Gaussian Blur > Dissolve > Bitmap (50% Threshold). The other way I made the vector curve to Shadow > Dissolve > Bitmap. However, both methods don't have the same noise effect with the picture. Do you guys have any other suggestion?

Thanks! enter image description here

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That is not "noise" it is a Diffusion Dither.

Use the same procedure as your case 1, but choose Diffusion Dither instead of 50% Threshold.

Play with the resolutions and scales. Also play with the curves in your original image to achieve more or less dither.

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