This section describes &chalk;'s palettes. The palettes are usually found at the right hand side of &chalk;'s main window. There are three palettes which help you in customizing your images: The Control box contains three tabs. You can get an overview of the image, view a color histogram, and modify options for the current tool. The Overview tab The Overview tab The Overview tab This tab offers you two settings. With the spinbox, slider, and 1:1 button at the bottom, you can set the zoom level for the document. The Exposure slider and textbox can be used to choose the exposure level for OpenEXR images. Furthermore, the X and Y labels indicate the current pointer position, with (0,0) being the top left corner of the canvas. The Histogram tab The Histogram tab The Histogram tab This tab displays a color histogram showing the distribution of colors over the image. The histogram is split up in red, green and blue levels. Actually, there is no tab named like this, since the tab name changes to reflect the name of the currently selected tool. This tab shows the customization options available for the tools that have them. The Tool tab for Brush The Tool tab for Brush The Tool tab for Brush There are three options available on this tab. The Opacity slider and spin box are used to set the opacity when drawing (opacity is the opposite of transparency, i.e. 100% opaque is 0% transparent, and vice versa). In the Mode drop down box, you can choose a drawing mode. This changes the actual effect that results from drawing on the image (for example, only changing the saturation or lightness). With the Paint direct option, you can determine whether you want to paint directly on the current layer, or on a temporary layer which is then composited onto the actual layer. This makes a difference especially when using relative low opacity values. The Tool tab for Line The Tool tab for Line The Tool tab for Line See Brush for the description of Opacity and Mode. The ? button shows a tip about the usage of modifier keys. The Tool tab for Rectangle The Tool tab for Rectangle The Tool tab for Rectangle See Brush for a description of Opacity and Mode. The Fill drop down box is used to specify whether the inside of the rectangle should be filled. You can choose between three fill options: the current foreground color, background color or pattern is used. See Brush for the description of Mode and Opacity. The same options as for Rectangle are available here. The same options as for Rectangle are available here. The same options as for Line are available here. The Tool tab for Star The Tool tab for Star The Tool tab for Star The options for Rectangle are available here, as well as two options specific to this tool. The Vertices drop down box is used to set the amount of vertices (points) in the star. The Ratio setting defines the shape of the star. A ratio of 0% will create a star with no inner area (when drawing the star, the two lines that make up a star point, overlap). Increasing the ratio will slowly make the star more outlined (the two lines are pulled apart). A star with a ratio of 100% is a regular polygon. The Tool tab for Duplicate The Tool tab for Duplicate The Tool tab for Duplicate The same options as for Line are available here. In addition, there are three other options. With the Healing and Healing radius options, you can specify that the duplication should not copy the colors, but only the structure of the source area. If you enable the Correct the perspective option, the duplicate tool will follow your perspective grid. The Tool tab for Paint with Filters The Tool tab for Paint with Filters The Tool tab for Paint with Filters Depending on the filter, you can set different options here. The options you can set are the same as those available in the normal settings dialog for the chosen filter. See the Filters section in the Dialogs chapter for more information. The Tool tab for Transform The Tool tab for Transform The Tool tab for Transform You can choose which transformation algorithm to use in the Filter drop down box. The Tool tab for Crop The Tool tab for Crop The Tool tab for Crop Set the corner coordinates of the area that should remain with the four spin boxes X, Y, Width and Height. You can also fill in Ratio to determine the Y/X ratio. Check one of the checkboxes to have the respective value remain constant while changing the size of the area. The drop down box can be used to select whether the entire image or only the current layer should be cropped. Clicking the Crop button has the same effect as double-clicking outside the area in the image. The Tool tab for Contiguous Fill The Tool tab for Contiguous Fill The Tool tab for Contiguous Fill The same options as for Brush are available here, as are a couple of other options. The setting in the Threshold slider and spin box determines how near the color of a point should be to the color of the starting point of the fill, in order for the fill to spread out over the former point. A higher threshold will therefore fill areas that have less similar colors, a lower threshold limits the spread. If you check the Fill entire selection checkbox, the entire selection will be filled instead of only the neighboring area. Checking the Limit to current layer checkbox changes the behavior of the fill: the extent to which the fill is done, is determined from the current layer only instead of the entire image. By checking the Use pattern checkbox you can choose to fill with the currently selected pattern instead of with the foreground color. The Tool tab for Gradient The Tool tab for Gradient The Tool tab for Gradient The same options as for Brush are available here, as are a couple of other options. The Shape drop down box can be used to select the gradient type: Linear, Bi-Linear, Radial, Square, Conical and Conical Symmetric. The Repeat option determines whether the gradient is repeated if it does not fill the entire image. With None, the colors on the ends of the gradient are used to fill the remaining space. With Forwards, the gradient is normally repeated (connecting the back end of one occurrence with the front end of the next). With Alternating, the gradient is repeated with every second occurrence being drawn from back to front (linking front to front and back to back). Check the Reverse checkbox to have the gradient drawn reversed (from back to front). The final setting is Anti-alias threshold, which determines how smooth the gradient will become. The Tool tab for Text The Tool tab for Text The Tool tab for Text The same options as for Brush are available here. Furthermore there is an option Font, which shows the font that will be used for the text. Click the ... button to change the font. The Tool tab for Color Picker The Tool tab for Color Picker The Tool tab for Color Picker The first option is a dropdown box in which you can choose which layer to pick the color from. If you choose a specific layer, the color of the point in that layer will be retrieved. With Sample All Visible Layers, the topmost visible layer which is not transparent at that point is used. If the Update current color checkbox is checked, then the current foreground color (when clicking with the &LMB;) or background color (when clicking with the &RMB;) is set to the picked color. The checkbox Add to palette and the accompanying dropdown box determine whether the picked color should be added to an existing palette. Check the checkbox, and choose the desired palette from the list, if you want to do so. The checkbox Show colors as percentages switches the range of color values displayed from the normal range (e.g. 0 to 255) to a scaled value between 0% and 100%. With the Sample radius option, you can choose the area size to use when picking the color. A radius of one just picks one pixel, larger radii will make the picker average over the colors of the circle-shaped area with the chosen radius that is centered around the chosen pixel. The Tool tab for Select tools The Tool tab for Select tools The Tool tab for Select tools The Paint Selection, Erase Selection, Select Rectangular, Select Elliptical, Select Polygonal and Select Outline tools have one option: the Action to perform. You can choose between Add to, or Subtract from the selection. The Tool tab for Select Contiguous The Tool tab for Select Contiguous The Tool tab for Select Contiguous The Action is the same as discussed with the Select operations. The slider and spin box at Fuzziness determine how near colors must be to the color at the clicked point to be added to the selection. When the Sample merged checkbox is checked, the bounds of the selection are determined by looking at the entire image instead of at the current layer. The Action and Fuzziness options are the same as with Select contiguous. The Tool tab for Select Magnetic The Tool tab for Select Magnetic The Tool tab for Select Magnetic The Action option is the same as with the other Select tools. The Distance option determines the maximal distance at which boundaries to attach to, are searched for. The To Selection button has the same effect as double-clicking the &LMB;: the selection is finished. In this palette you can choose the foreground and background colors that should be used for painting. You can choose these in five different ways. Each of these has its own tab on this palette. You can choose which color to set by clicking the corresponding buttons at the top left. The topmost color is the foreground color, the bottom one is the background color. You can click the double-headed arrow to swap the colors: foreground color becomes background color and vice versa. You can reset the colors to the default (foreground black, background white) by clicking the small black/white icon. The HSV tab The HSV tab The HSV tab On this tab, you can select a color via the Hue / Saturation / Value system. The hue determines the major color and starts at red with 0, then increases along the color spectrum (that is, along the line yellow, green, blue, violet) to a maximum of 359. This is represented in the circle on the tab as the angle component (starting at the top, rotate along the circle in clockwise direction to increase the hue). The saturation determines the pureness of the color. A saturation of 255 yields the pure color, while a saturation of 0 yields a gray. This is the radius component of the color circle on the tab: the center corresponds to no saturation, the circle boundary corresponds to fully saturated. The value determines the lightness of the color. This darkens or lightens the color, as can be set using the vertical slider on the tab. A value of 0 gives black, a value of 255 gives the pure color. The RGB tab The RGB tab The RGB tab On this tab, colors can be selected using their Red / Green / Blue components. You can set red, green and blue components on a scale of 0 to 255. At 0 that color component is absent, at 255 it is used at maximum intensity. The sliders will change color to give you a hint about which color you will produce by altering the corresponding value. The Gray tab The Gray tab The Gray tab On this tab, you can choose a gray value (indicated with a K for Key, the usual designation for black). The gray value can be chosen on a scale from 0 (pure white) to 255 (pure black). The Palettes tab The Palettes tab The Palettes tab On this tab, you can select a color from one of several predefined color palettes. You can choose which color palette to pick from in the drop down box at the top. The Watercolors tab The Watercolors tab The Watercolors tab This tab offers you a selection of watercolors for painting with wet paint. You can set two options to modify the painting behaviour: Paint strength influences how much paint you will apply to the canvas, and Wetness determines how wet the paint is when it is applied. You can dry the paint later. This palette offers two tabs. The Layers tab The Layers tab The Layers tab This tab offers you access to various operations on layers. On the top left, you can select what blending mode should be used for the selected layer. These are the same possibilities as you can choose from for drawing modes. The slider/textbox at the top right determines the opacity of the selected layer. 0% opacity corresponds to 100% transparency, and vice versa. The list shows all layers and their names, and offers various controls for each layer. The eye icon toggles whether the layer is visible or not. The link icon is used to link layers together. The lock icon determines if the layer is locked or not. Locked layers cannot be edited. Below the layer list, there are some other controls. You can create a new layer, move the current layer up or down, show the layer's properties and delete it. There are some more handy tricks you can do with the mouse within the list. Right-click on the layer list and select New Folder to create a new layer folder, which you can use to group layers in. You can also drag and drop layers to change their order. To do so, click on the bottom part of the list item representing the layer, drag the mouse, and release the mouse button at the desired position. If you click at the top part of the list item instead, you will get a text field so that you can rename the layer. The Script Manager tab The Script Manager tab The Script Manager tab This tab is a smaller version of the Script Manager dialog. See the description over there for more information.