4.12. Wavelet Decompose
| 4. Îmbunătățirea filtrelor |

### 4.12. Wavelet Decompose

#### 4.12.1. Overview

| Notă
Explanations are mostly inspired from the Pat David's tutorials https://patdavid.net/2011/12/getting-around-in-gimp-skin-retouching.html and https://patdavid.net/2014/07/wavelet-decompose-again.html.

Fig. 17.43. Example for „Wavelet decompose” filter

Original image

„Wavelet Decompose” applied. Only scale 2 is made visible in the layer group.

This filter decomposes the active layer or selection into several layers, named „scales”, each of them containing a particular set of details. Finest details are in first layers and they become larger until you get to the last one, at bottom. This last layer is called „residual” and holds what is left after all detail layers have been removed; it represents the global contrast and colors of the image.

Each of scale layers are set to combine using the Grain Merge layer mode. This means that pixels that have a 50% value will not affect the final result. So, painting a wavelet scale with neutral gray (R:50% G:50% B:50%) will erase details.

Wavelet-decompose is a wonderful filter for skin smoothing and retouching, removing blemishes, wrinkles, spots from your photos. It can be used also for sharpening and local contrast enhancement and for removing stains, colors, tones. All this is well explained in tutorials mentioned above.

#### 4.12.2. Activating the filter

This filter is found in the image window menu under Filters → Enhance → Wavelet decompose.

#### 4.12.3. Options

Fig. 17.44. „Wavelet decompose” options

Scales: Default scales number is 5. You can increase it to increase scale fineness.

Create a layer group to store the decomposition: layer groups are treated in Secțiune 4, „Grupuri de straturi”.

Add a layer mask to each scale layer: layer masks are treated in Secțiune 2.1.3, „Layer masks”.

4.11. NL Filter |  | 5. Deformarea filtrelor

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