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公演情報 | リアル脱出ゲーム | 体験型謎解きエンターテインメント.Using Nik Plug-ins Stand-alone or Inside Nikon Capture NX-D
This approach is completely different to the more familiar local editing methods used in applications such as GIMP, Photoshop, etc. These methods can be time consuming and difficult to use accurately when complex shapes are involved. An RT-spot consists of either an ellipse or a rectangle with a variable-diameter circle at the center. The shapes have four control points, which can be adjusted independently or symmetrically. The rectangle spot can also be used in full-image mode which automatically sets the control points outside the image preview area.
Future developments will provide enhanced shape manipulation. The reference values used for the shape detection algorithm are based on the average of the hue, chroma and luminance values inside the variable-diameter circle. This means that in full-image mode and also in Normal or Excluding modes these values and the subsequent shape detection can vary depending on the position of the circle.
The extent to which these modifications are applied can be finely controlled allowing for very precise selections. Further refinement is possible with additional parametric masks but the shape-detection algorithms should be sufficient for the vast majority of local editing requirements. RT-spots can also be used in Excluding mode to prevent the algorithm from influencing certain parts of the image.
The modifications that can be carried out are extensive and incorporate most of the functions available in RawTherapee's global adjustment tools along with some additional tools available only in the Local Adjustments tab.
Adjust color, lightness, contrast and correct small defects such as red-eye, sensor dust etc. Can be used instead of, or in conjunction with the Exposure module. Can also be used as a graduated filter. Adjust vibrance essentially the same as the global adjustment. Laplacian operators are used because they are particularly good at detecting fine details but you do not need to understand how they work to use this tool!
A tool in its own right. Can be used to adjust the image appearance chrominance, luminance, contrast and texture as a function of Scope.
Apply a Soft-light blend identical to the global adjustment. Carry out dodge and burn using the original Retinex algorithm. Same as the tone mapping tool in the main menu. The main menu tool must be deactivated if this tool is used. Dehaze and Retinex Advanced mode only. Useful for dehaze, local contrast with high values and simulation of "clarity".
The default mode can be set in RawTherapee's Preferences window. Most of the local-adjustment tools can be used together in the same RT-spot. If you do wish to use combinations of the 3 tools mentioned above you can simply add another RT-spot in close proximity to the first one. Other tools can be added to either of the two RT-spots as required. The examples in the next section are designed to give an overview of some of the ways the various tools can be used for local adjustments.
This will give you a simplified yet powerful version of Local Adjustments. Please note: the screenshots in the following examples are currently being updated to take into account the latest developments. Because of this, some of the slider and module names will be different from the text.
Position the RT-spot at the desired location. In this case, we want to increase the saturation of the red flower and reduce the luminance lightness without affecting the rest of the image. You can preview the areas of the image that will be affected by any changes. The preview does not show the changes themselves or the transitions, but allows you to set the scope of any adjustments. Local adjustments are not limited to local touch-ups. You can also use the Local Adjustments tool to process the full image.
The principle is the same as above for removing small sensor faults but in this example we will use different tools. In many portraits, or photos where light falls directly on the skin, an unpleasant contrast-enhancement phenomenon occurs. Some parts of the skin are slightly overexposed, while others are slightly underexposed.
Note: Laplacian operators are used because they are particularly good at detecting fine details and Poisson equations are used to solve the partial differential equation generated by the Laplacian and make the tool usable. But you do not need to understand how they work to use this tool! It can be used to process images with large differences in exposure that are often globally underexposed.
Raw file Creative Common Attribution-share Alike 4. This example is for demonstration purposes only so that we can see the various non-exhaustive possibilities for adjusting exposure.
The settings are arbitrary. If you do use Exposure, then it is recommended but not mandatory to change the parameters of "Shape detection" in Settings as follows:. We are going to process a very hazy image by first applying the global Haze Removal tool in the Detail tab and then touch up the sky and horizon using Retinex in Local Adjustments.
Raw file : Pixls. We could have used the Dehaze tool in Local Adjustments but when you look at the image there is a lot of haze in the background and the hills so it is better to use a two-step approach. Isolating a subject against a background is a common problem in photography. The subject can be an animal, a plant, a person and the background the sky, grass, a forest, a wall etc. The problem is a complex one for noise reduction software because the algorithm usually "ignores" the difference between the subject and the background.
This means that removing noise in the background will cause a loss of detail, contrast and color in the subject. I chose this image, with the agreement of its author Andy Astbury, because not only is it excellent the animal stands out very well against a gray background but it is also slightly noisy. Removing the noise using only the Noise Reduction tool in the Detail tab will inevitably lead to a loss of detail and a reduction in contrast and saturation in the mouse. PP3 file [7] The pp3 file is provided as a guide to the tools and possible settings that can be used in cases like this.
They are not necessarily the "right" settings. Traditionally noise is removed in Rawtherapee using the Noise Reduction module Detail tab. If we try to remove the luminance and chrominance noise in the background we end up with settings not shown in the screenshot in the order of:. Certainly the background will be perfect, but our little harvest mouse will become dull and washed out. So how can we go about denoising this image?
Note that this document is for didactic purposes and the settings are designed to clearly demonstrate the different steps rather than to produce a beautiful image. The image below only shows the tone equalizer settings and not the luminance and chrominance denoise settings that were made in the Noise Reduction module Detail tab. Lockable Color Pickers have been placed on the eye, the fur, the vegetation, and the tail.
Familiarize yourself with each of the 5 tools mentioned above, one by one. This mask will be used to differentiate the denoise between the background and the rest of the image i.
Comparison of Denoise tools Comparison of the 3 Rawtherapee noise reduction tools. Thanks once again to Andy Astbury for this excellent image, which allows us to demonstrate 5 ways of differentiating noise reduction between uniform areas and areas with detail.
In a difficult image it will probably be necessary to activate all 5 methods to try and find the right balance. The result is a matter of individual taste and is quite subjective. Each RT-spot can be thought of as a layer and the "Merge file" function allows you to merge up to 2 RT-spots with the original image. As an example we will use these features to create a variable blur of course this isn't the only application. The area between the dark and light areas can be adjusted with the "Recovery based on luminance mask" slider.
File pp3; [12]. Note the use of Blur Mask with "Contrast threshold" and Radius. When you use the LC h curve to create a mask, the image of the mask can sometimes be covered with black and white dots salt and pepper noise that prevent the mask from functioning correctly. The image used in the above example does not demonstrate this effect very well because it is not very noisy, so I have chosen a different image with significant chromatic noise.
Adjust the slider until you get the desired effect. For example, if you use the C curve to create a mask, artifacts clumps of grayish spots may appear when the mask is merged with the original image.
It is likely that this is also due to chromatic noise, in which case you can use the above procedure to correct the problem. This mask does not work in exactly the same way the other Local Adjustments masks. You can use it to change the appearance of an image e. Of course, you can create as many Common Color Masks as you want. Simply duplicate the mask and place it close to the previous one and use similar settings.
Note that the effect of the combined LC H curve can be visualised by referring to the spatial representation of the Lch coordinates i. The portrait of Mairi gives us the opportunity to use several local-adjustment tools. We are going to:. The corresponding. The borders are added inside the existing image area, unlike other programs, which usually increase the image size by adding the border outside the image area.
You can customize the border presets by changing the width vertical or horizontal borders or the color. You can also use "partial paste" to apply any modifications to the presets to other images. Please note that the following explanations may be controversial, especially for JzCzHz and part of Cam16 because:.
It has very marked shadows and strong sunlit backlighting. Use the default RawTherapee settings and position the lockable color pickers as shown so that you can see the changes when processing. Raw file Pixls. For this example, and for comparison with Lift the shadows , the following arbitrary settings are used:.
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