Matlab colormap editor

I recently wanted a colormap that was distinctive. I wanted the zero values to be one color while the negative and positive values were different shades. This video shows how to do this interactively. The skills shown here work for lots of different colormap tasks.

Setting the Colormap to be Consistent Across Axes. Creating a Basic Plot Interactively. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location.

This website uses cookies to improve your user experience, personalize content and ads, and analyze website traffic.

matlab colormap editor

By continuing to use this website, you consent to our use of cookies. Video e Webinar. Video Video MathWorks Search.

Subscribe to RSS

Ricerca MathWorks. Home Video Cerca. Contattaci Software di prova. Register to watch video. Related Videos and Webinars Modifying a Colormap Interactively. Select a Web Site Choose a web site to get translated content where available and see local events and offers. Select web site.Documentation Help Center. The Colormap Editor allows you to customize the colormap of the current figure.

Dragging a color marker along the displayed colormap changes the position of a color transition. Double-clicking a marker allows you to change the color at that position.

Load the mri dataset, and display one of image slices using the hot colormap. Open the Colormap Editor. Save the colormap in the variable c. You can use c to apply the new colormap to different plots. Color markers allow you to change the color and length of transitions in the colormap. Click below the corresponding cell in the displayed colormap. Adjacent markers: left-click the first marker. Then press Shift before clicking the last marker.

Nonadjacent markers: left-click first marker. Then hold the Ctrl key as you click the other markers. Select and drag the marker. You can also press the left and right arrow keys instead of dragging the marker.

Select multiple markers, and use the left and right arrow keys to move markers as a group. The movement stops when one of the selected markers encounters unselected marker or an end marker. Select the marker, and perform one of the following actions:. Hue corresponds to the values on a color wheel that transition from red to orange, yellow, green, cyan, blue, magenta, and finally back to red. Hue interpolation is calculated as the shortest distance between adjacent colors on the color wheel.

When you change the Interpolating colorspacethe Colormap Editor preserves the number, color, and location of markers, which can cause the colormap to change. Colormap lower limit, specified as a number. All values in your plot data that are less than or equal to the value of Color data min map to the first color in the colormap.

All values between Color data min and Color data max map linearly to the intermediate colors of the colormap. When you change Color data min and Color data maxthose changes are reflected in the CLim property of the plotting axes. Colormap upper limit, specified as a number.

All values in your plot data that are greater than or equal to the value of Color data max map to the last color in the colormap.

To save a colormap after making changes, call the colormap function. Specify the current axes as the input argument, and specify an output argument to store the colormap. When you move the cursor over the displayed colormap or any of its markers, the following information displays in the Current color info section:. Index — The row in the colormap array that corresponds to the current color.

CData — The corresponding value in the CData property of the graphics object that is using the colormap. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance.Documentation Help Center. The Colormap Editor allows you to customize the colormap of the current figure. Dragging a color marker along the displayed colormap changes the position of a color transition.

Double-clicking a marker allows you to change the color at that position. Load the mri dataset, and display one of image slices using the hot colormap. Open the Colormap Editor. Save the colormap in the variable c. You can use c to apply the new colormap to different plots. Color markers allow you to change the color and length of transitions in the colormap.

Click below the corresponding cell in the displayed colormap. Adjacent markers: left-click the first marker. Then press Shift before clicking the last marker. Nonadjacent markers: left-click first marker. Then hold the Ctrl key as you click the other markers. Select and drag the marker. You can also press the left and right arrow keys instead of dragging the marker.

Select multiple markers, and use the left and right arrow keys to move markers as a group. The movement stops when one of the selected markers encounters unselected marker or an end marker. Select the marker, and perform one of the following actions:.

Hue corresponds to the values on a color wheel that transition from red to orange, yellow, green, cyan, blue, magenta, and finally back to red.

Hue interpolation is calculated as the shortest distance between adjacent colors on the color wheel. When you change the Interpolating colorspacethe Colormap Editor preserves the number, color, and location of markers, which can cause the colormap to change. Colormap lower limit, specified as a number. All values in your plot data that are less than or equal to the value of Color data min map to the first color in the colormap.

matlab colormap editor

All values between Color data min and Color data max map linearly to the intermediate colors of the colormap. When you change Color data min and Color data maxthose changes are reflected in the CLim property of the plotting axes. Colormap upper limit, specified as a number. All values in your plot data that are greater than or equal to the value of Color data max map to the last color in the colormap.

To save a colormap after making changes, call the colormap function. Specify the current axes as the input argument, and specify an output argument to store the colormap. When you move the cursor over the displayed colormap or any of its markers, the following information displays in the Current color info section:. Index — The row in the colormap array that corresponds to the current color. CData — The corresponding value in the CData property of the graphics object that is using the colormap.

Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance.

saving edited colormap data

Other MathWorks country sites are not optimized for visits from your location.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. When I then try to use the saved mycmap for another figure, it ignores all modifications und uses the basic colormap parula.

The definition of colormaps is deeply hidden inside the figure class, which is not accessible. So you can't save your colormap "with a name" in Matlab and access it like a normal colormap. But a colormap is nothin else than a Yx3 matrix, you can store on disk. You used the colormap editor to create your colormap.

After you applied it, use the following code to get the required matrix for further reference:. If you want to make the colormap generally available to all your functions, no matter where, add it to your Matlab search path. Learn more. How to save a custom colormap and use it again in Matlab? Ask Question. Asked 2 years, 9 months ago. Active 2 years, 9 months ago. Viewed 4k times. However, I am not able to save this as a colormap.

Error using matlab. Thanks for help. How can I save it and use it as another colormap in any figure I want? Markus Markus 33 1 1 silver badge 6 6 bronze badges.

Active Oldest Votes. Thanks that worked perfectly. I integrated the obtained matrix in a m-file like in those mathworks. The colormap is now universally usable. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.Syntax colormapeditor D escription colormapeditor displays the current figure's colormap as a strip of rectangular cells in the colormap editor. Node pointers are colored cells below the colormap strip that indicate points in the colormap where the rate of the variation of R, G, and B values change.

You can also start the colormap editor by selecting Colormap from the Edit menu. Node Pointer Operations You can select and move node pointers to change a range of colors in the colormap. The color of a node pointer remains constant as you move it, but the colormap changes by linearly interpolating the RGB values between nodes.

Change the color at a node by double-clicking the node pointer. Move multiple nodes Select multiple nodes and use the left and right arrow keys to move nodes as a group. Movement stops when one of the selected nodes hits an unselected node or an end node. Display color picker for a node Double click on the node pointer. Current Color Info When you put the mouse over a color cell or node pointer, the colormap editor displays the following information about that colormap element:.

matlab colormap editor

Interpolating Colorspace The colorspace determines what values are used to calculate the colors of cells between nodes.

For example, in the RGB colorspace, internode colors are calculated by linearly interpolating the red, green, and blue intensity values from one node to the next. Switching to the HSV colorspace causes the colormap editor to recalculate the colors between nodes using the hue, saturation, and value components of the color definition. Note that when you switch from one colorspace to another, the color editor preserves the number, color, and location of the node pointers, which can cause the colormap to change.

Interpolating in HSV: Since hue is conceptually mapped about a color circle, the interpolation between hue values can be ambiguous. To minimize this ambiguity, the interpolation uses the shortest distance around the circle. For example, interpolating between two nodes, one with at hue of 2 slightly orange red and another with a hue of slightly magenta reddoes not result in hues 3,4, These values change the mapping of object color data the CData property of images, patches, and surfaces to the colormap.

The graph is a slice plane illustrating a cross section of fluid flow through a jet nozzle. See the slice reference page for more information on this type of graph. Example Objectives The objectives are as follows:.

The following picture shows the desired coloring of the slice plane. The colorbar shows the data to color mapping. Click Run Demo if you want to run a demonstration of the example. Initially, the default colormap jet colored the slice plane, as illustrated in the following picture. Note that this example uses a colormap that is 48 elements to display wider bands of color the default is 64 elements. The slice plane now has the desired range of colors for negative, zero, and positive data.

See Also colormap.Syntax colormapeditor D escription colormapeditor displays the current figure's colormap as a strip of rectangular cells in the colormap editor. Node pointers are colored cells below the colormap strip that indicate points in the colormap where the rate of the variation of R, G, and B values changes. You can also start the colormap editor by selecting Colormap from the Edit menu. Node Pointer Operations You can select and move node pointers to change a range of colors in the colormap.

The color of a node pointer remains constant as you move it, but the colormap changes by linearly interpolating the RGB values between nodes. Change the color at a node by double-clicking the node pointer.

Colormap Editor

Operation How to Perform Add a node Click below the corresponding cell in the colormap strip. Select a node Left-click the node. Move a node Select and drag with the mouse or select and use the left and right arrow keys. Move multiple nodes Select multiple nodes and use the left and right arrow keys to move nodes as a group. Movement stops when one of the selected nodes hits an unselected node or an end node.

Display color picker for a node Double-click the node pointer. Current Color Info When you put the mouse over a color cell or node pointer, the colormap editor displays the following information about that colormap element:.

Interpolating Colorspace The colorspace determines what values are used to calculate the colors of cells between nodes. For example, in the RGB colorspace, internode colors are calculated by linearly interpolating the red, green, and blue intensity values from one node to the next. Switching to the HSV colorspace causes the colormap editor to recalculate the colors between nodes using the hue, saturation, and value components of the color definition.

Note that when you switch from one colorspace to another, the color editor preserves the number, color, and location of the node pointers, which can cause the colormap to change. Interpolating in HSV: Since hue is conceptually mapped about a color circle, the interpolation between hue values can be ambiguous. To minimize this ambiguity, the interpolation uses the shortest distance around the circle.

For example, interpolating between two nodes, one with hue of 2 slightly orange red and another with a hue of slightly magenta reddoes not result in hues 3,4,Documentation Help Center.

The Colormap Editor allows you to customize the colormap of the current figure. Dragging a color marker along the displayed colormap changes the position of a color transition. Double-clicking a marker allows you to change the color at that position.

Load the mri dataset, and display one of image slices using the hot colormap. Open the Colormap Editor. Save the colormap in the variable c. You can use c to apply the new colormap to different plots. Color markers allow you to change the color and length of transitions in the colormap.

Click below the corresponding cell in the displayed colormap. Adjacent markers: left-click the first marker. Then press Shift before clicking the last marker. Nonadjacent markers: left-click first marker. Then hold the Ctrl key as you click the other markers. Select and drag the marker. You can also press the left and right arrow keys instead of dragging the marker.

Select multiple markers, and use the left and right arrow keys to move markers as a group. The movement stops when one of the selected markers encounters unselected marker or an end marker. Select the marker, and perform one of the following actions:. Hue corresponds to the values on a color wheel that transition from red to orange, yellow, green, cyan, blue, magenta, and finally back to red. Hue interpolation is calculated as the shortest distance between adjacent colors on the color wheel.

When you change the Interpolating colorspacethe Colormap Editor preserves the number, color, and location of markers, which can cause the colormap to change. Colormap lower limit, specified as a number. All values in your plot data that are less than or equal to the value of Color data min map to the first color in the colormap. All values between Color data min and Color data max map linearly to the intermediate colors of the colormap.

When you change Color data min and Color data maxthose changes are reflected in the CLim property of the plotting axes. Colormap upper limit, specified as a number. All values in your plot data that are greater than or equal to the value of Color data max map to the last color in the colormap.

To save a colormap after making changes, call the colormap function. Specify the current axes as the input argument, and specify an output argument to store the colormap. When you move the cursor over the displayed colormap or any of its markers, the following information displays in the Current color info section:.

Index — The row in the colormap array that corresponds to the current color. CData — The corresponding value in the CData property of the graphics object that is using the colormap.