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 GIMP is a free open source video editor where people can edit and manipulate their images. It consists of plugins and extensions to do anything. The GIMP application provides filters, a special type of tool designed to take an input layer or image, apply a mathematical algorithm to it, and return the input layer or image in a modified format.

What is the Enhancement Filter in GIMP?

Enhancement filters are used to compensate for imperfections in the image. These imperfections include dust particles, noise, interlaced frames, and insufficient sharpness. The Enhancement Filter menu provides several tools such as Antialiasing, Deinterlacing, High Pass, Noise Reduction, Red Eye Removal, Symmetric Nearest Neighbor, Sharpen (Unsharp Mask), Detach , the destripe, the NL filter and the wavelet decomposition.

How to Use Filters in GIMP?

GIMP uses filters to achieve various effects and has several categories, namely: Blur Filters, Enhancement Filters, Distortion Filters, Light and Shadow Filters, Noise Filters, Edge Detection Filters, Generic Filters, Combo Filters, Art Filter, Scenery Filter, Map Filters, Render Filters, Web Filters, and Animation Filters. To use filters in GIMP, you need to select the image with a selection tool, then go to filters in the menu bar and choose a filter from the list.

How to Use Enhance Filters in The Gimp

We will explain the following topics:

  1. How to use the Antialias filter
  2. How to use the deinterlace filter
  3. How to use the high pass filter
  4. How to use the noise reduction filter
  5. 5. How to use the red-eye filter
  6. How to use symmetric nearest neighbor filter
  7. How to use the Sharpen filter (Unsharp Mask)
  8. How to use the Depeckle filter
  9. How to use the Destripe filter
  10. How to use the NL filter
  11. How to use wavelet decomposition

1]How to use the Antialias filter in Gimp?

This filter reduces aliasing effects using the Scale3X edge extrapolation algorithm.

Open GIMP and have your image ready to use.

Click Filter in the menu bar, hover over Enhance , and select Antialiasing .

The effect is automatically applied to the image.

2]How to use the Deinterlace filter in GIMP?

The deinterlacing filter retains only one of the two images and replaces missing lines with a gradient between the preceding and following lines, especially if the images appear blurry and stripped down.

Click Filter in the menu bar, hover over Enhance and select Deinterlace .

Deinterlace dialog box will appear.

The dialog contains the Keep even fields and Keep odd fields choices; try both to see which suits your photo best.


You can also change the Orientation and use the Block Size slider and input boxes.

Check the Preview checkbox to preview your image.

Then click OK .

3]How to use High Pass in GIMP?

Open the picture.

Click on Layer in the menu bar and select Duplicate Layer .

A copy of the layer will appear to the right of the GIMP interface.

Go to Filter in the menu bar, hover over Enhance and select the High Pass effect.

High Pass dialog box will open.

To the right of the GIMP interface, change the mode to Soft Light ; You can also try Strong Light .

Go back to the High Pass dialog box and customize the effect of the High Pass by clicking on the input fields of Std. Dev. and Contrast .

Then click OK .

4]How to use noise reduction filter in GIMP?

The noise reduction filter is a simple GEGL filter to reduce noise.

Go to Filter in the menu bar, hover over Enhance and select the Noise Reduction effect.

Noise Reduction dialog box will open.

In the dialog box, Force reduces noise and increases blur.

Check the Preview checkbox to preview your image.

Then click OK .

5]How to use the red-eye filter in GIMP?

The purpose of the red-eye filter is to remove red-eye from images.

Open the picture.

Click click either the Lasso select or Ellipse select tool.

If you don't see the Eclipse tool, press the E key.

Draw the selection tool over the eyes in the image.

Click Filter in the menu bar, hover over Enhance , and select the Red-Eye Removal effect.

If you move the Threshold the red color to be removed will vary.

Click OK .

6]How to use symmetric nearest neighbor filter in GIMP?

The symmetric nearest-neighbor effect blurs the edges of the image while preserving.

Open the picture.

Click Filter in the menu bar, hover over Enhance , and select the Symmetric Nearest Neighbor effect.

How to use the Enhance filters in Gimp

Symmetric Nearest Neighbor dialog box will open.

In the dialog you can increase or decrease the radius and select 1 or 2 pairs (a higher number preserves sharper strokes).

Then click OK.

7]How to use the Sharpen filter (Unsharp Mask) in GIMP?

Blurry photographs and scanned images often require sharpening corrections.

Open the picture.

Duplicate the image layer.

Make sure it's the copy you want to see the difference.

Click Filter in the menu bar, hover over Enhance , and select the Sharpen (unsharp mask) effect.

Sharpen (unsharp mask) dialog box will open.

The Radius slider and input boxes allow the user to set the number of pixels on each side of an edge that will be affected by sharpening. High radius images allow for a higher radius.

The Amount slider and input boxes define the sharpness strength.

The At Threshold slider and input boxes allow users to set the minimum difference in pixel values ​​that indicates an edge where to apply to sharpen.


Then click OK .

8]How to use the Despeckle filter in GIMP?

The Depeckle filter removes small defects caused by dust or scratches on a scanned image.

Open the picture.

Click on Filter in the menu bar, hover over Enhance and select the Detach effect.

Detach dialog box will open.

Below Median there is the Adaptive and Recursive option.

The Adaptive option adapts the radius to the content of the image or selection by analyzing the histogram of the region around the target pixel. The adapted radius will always be equal to or less than the specified radius.

The Recursive option repeats the action of the filter, which becomes stronger.

the Radius defines the size of the action window from 1 to 20. This window moves over the image, and the color becomes smooth and removes imperfections.

The Black level only includes pixels brighter than the value set in the histogram.

the white level only includes pixels darker than the value defined in the histogram.

9]How to use the Destripe filter in GIMP?

The purpose of the Destripe filter is to remove vertical banding due to poor quality scanners

Open the picture.

Click on Filter in the menu bar, hover over Enhance and select the Peel off effect.

The Histogram is a black and white image showing the interference pattern more readably.

The Width slider and input box allow users to set the "strength" of the filter.

10]How to use the NL filter in GIMP?

The NL (non-linear) filter joins the smoothing, spot removal and sharpening functions. It works on the whole layer, not on the selection.

Open the picture.

Click on Filter in the menu bar, hover over Enhance and select the NL Effect .

NL Dialog will open.

Under Filter you have three modes, namely: Alpha cut means , Best estimate and Edge enhancement .

The Alpha filter removes pop or noise from a single pixel in an image without spreading noise or staining image features.

The Optimal estimate applies a smoothing filter adaptively over the image.

Edge enhancement improves the edges.

The Alpha slider and input boxes control the amount of filter to apply.

The Radius slider controls the size of the effective sampling region around each pixel.

11]How to use Wavelet-decompose in GIMP?

The wavelet decomposition filter decomposes the active layer or selection into several layers called ' Balance ' each of them containing a particular set of details.

Open the picture.

Click Filter in the menu bar, hover over Enhance , and select the Wavelet Explode effect.

Wavelet Decomposition dialog box will open.

You can use the Scale slider or input box to increase the fitness of the scale.

We hope this tutorial helps you understand how to use Enhance filters in GIMP.

If you have any questions about the tutorial, let us know in the comments.

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