Partial filtration

Some images contain both noisy and clean areas and it may be preferable to filter only noisy areas. This can be manually done by combining two images - original and filtered one - in an image editor. For example, the following steps can be followed if you use the standalone version of Neat Image:

1. Filter the input image in Neat Image (so that noisy areas are cleaned) and save the output image to a new file;
2. Open this new file in your image editor;
3. Place the filtered image in a new layer on top of the original image;
4. Adjust the transparency of the top layer so that noisy areas look fine;
5. Select and delete the areas of the top layer where filtration is not necessary or excessive (you may want to use the eraser tool with adjustable transparency and shape).

If you use the plug-in version of Neat Image filter then the partial filtration is even easier:

1. Open the input image in your image editor;
2. Copy the input image in a new layer on top of the original image;
3. Apply Neat Image noise reduction to the top layer;
4. Adjust the transparency of the top layer so that noisy areas look fine;
5. Select and delete the areas of the top layer where filtration is not necessary or excessive (you may want to use the eraser tool with adjustable transparency and shape).