If one of the layers is currently selected in the layers panel, the toolbar contains controls for the current layer.
"Clear" - delete the current module, i.e. clear the current layer, leave it empty.
"Reset" - for all components contained in this layer, reset the runtime parameters (all current settings) to their default values.
"Merge" - merge the current grading according to all layers and their parameters and place it into the 3D LUT component on a new overridden layer (a layer with the "override" mixing mode).
"Random" - randomize all components of the current layer with the specified amount of randomization (slider to the right of the button).
Layer properties menu
You can switch the mixing mode of the layer between the two types:
"Blend" - mixing the color correction of the current layer with all the processing specified by the previous layers in accordance with the specified blend mode. Thus, previous layers have an impact on the image processing in the current layer.
"Override" - replacement of all processing specified by the previous layers with the color correction of the current layer. It is usually used together with masks to process local areas of the image when it is necessary to do it independently of other color correction set by the previous layers.
Overlay modes are implemented in accordance with the well known standard modes, such as Multiply, Screen, Overlay, etc., with the difference that they also work with HDR colors. In addition to the standard modes, there is a specific mode "maximum correction". In this mode, two layers are mixed in such a way that as a result there are strong changes of one colors in the first layer and strong changes of other colors in the second layer. Thus, the mode allows you to mix two color corrections (for example, two LUTs) so that the result is a correction that has the most expressed elements of both corrections. In this mode, the layer has another additional slider "balance" (along with "opacity"), which regulates the priorities of the two adjacent layers.
This group contains components into which the color correction of the current layer can be divided. The following color components (one or more) may be partially or completely excluded from processing):
•"1D" – one-dimensional color correction (can be considered as a master curve extracted from the full color correction layer),
•"1D-R" – one-dimensional color correction of the R channel (can be considered as the curve of the R channel extracted from the full color correction of the layer),
•"1D-G" – one-dimensional color correction of the G channel (can be considered as a curve of the G channel extracted from the full color correction of the layer),
•"1D-B" – one-dimensional color correction of channel B (can be considered as a curve of channel B extracted from the full color correction layer),
•"3D" - three-dimensional color correction, remaining after the extraction of all four of the one-dimensional color corrections from full color correction layer.
You can use the "Apply components" group of options if you want to apply the color correction of the current layer not entirely to the color, but only to individual components of the color. The following color components (one or more) may be partially or completely excluded from processing):
•"Luminosity" – brightness component, independent of chromaticity - light, dark (component of polar variant of HCL model),
•"Saturation" – saturation/chroma component - juicy, pale (component of the polar version of the model HCL),
•"Hue" – hue component - red, yellow, etc. (component of the polar variant of the HCL model).
You can use the "Apply channels" group of options if you want to apply the color correction of the current layer not entirely to the color, but only to individual color channels. The following color channels (one or more) may be partially or completely excluded from processing):
•"Red channel" – red channel (RGB model component),
•"Green channel" – green channel (RGB model component),
•"Blue channel" – blue channel (RGB model component).
By default, all components are enabled, i.e. the layer color correction is applied to all listed components of the image color. Enabling / disabling components does not depend on the selected blend mode, i.e. you can combine blend modes and selective color components. Components are applied sequentially from top to bottom in the order in which they appear in the menu. The inclusion of each color component in the processing is determined not only by the checkbox "on/off", but also by the amount of application (round rotary slider).
Note: currently, the color space of the layer is always RGB, however, it is planned to support implementation of any of the available color spaces. This means that the output of a layer, for example, can be LAB, which will be passed to the input of the next layer. The group "apply components" will contain the components of the output color space (in this case: "Lightness", "Chroma", "Hue", "L", "A", "B").
Note: popular graphics and video editors have the following layer blend modes: "Hue", "Saturation", "Color" and "Luminosity" (names may vary). You can reproduce these blend modes using the "apply components" group, turning some color components on and off. The blending mode "Color" is just a combination of two of the included components "Hue" and "Saturation". Using this approach in GrossGrade gives you more facilities and provides more options by separating the logic of overlay modes from the logic of color components, which also stimulates a better understanding of color models.