Colormap in Geolog.pdf

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Colormaps

Geolog 7.2

Video Notes


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Printed March 17, 2015

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Chapter0

Colormaps in Geolog Chapter0

What Is a Colormap? ..

A colormap is a qualify function file which tells Geolog how to display certaintypes of data. Colormaps that you create are stored in the functions folder ofyour project by default. Geolog supplies a selection of colormaps, which arestored in the {INSTALLATION}/functions folder.

Typically, a colormap function is a file containing a series of lines, eachconsisting of a From value, a To value, and a Symbol.

The example colormap below, was created to color a GR log - so the values gofrom 0 api to 200 api in steps of 20 api. Each section is assigned a color, goingfrom blue between 0-20 api, through to red between 180-200 api. From 20 to180 api are an interpolated range of colors between the two end points.


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1In Layouts In the top layout example, a colormap has been used to shade the GR logbased on value of the GR, with light browns for the low api values (sands) and adarker browns for the higher api values (shales).

In the bottom layout, the colormap has been used to give the image array log amore defined appearance using earth colors to aid dip picking.


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6 Colormap Video Notes

2In Xplots For this density/neutron xplot, the shades of brown colormap used in the firstlayout above, has been used to color the GR values to help with parameterpicking sand and shale points.


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3In Mapsheets For this mapsheet, a colormap has been used to colorfill contours based on aninterval thickness grid calculated from well values.

Creating a Colormap ..

Colormaps are created and edited using the colormap menu at the bottom of theright hand sidebar.


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Also in this location is the Appearance menu - this is used to select the colors tobe used in the colormap which means it is probably easiest to drag one of thetwo from the tab group and float it adjacent to the other.

1To create a newcolormap

1 SelectFile > New.

2 SelectTools > Size.


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3 In the Colormap Size dialog box, after examining the data that the colormapwill be used with:

a Set Minimum value.

b Set Maximum value.

c Set number of Intervals.

d Click OK.

Note The above example is for use with a GR log, hence the minimum andmaximum values of 0 & 200.

4 Click in the first Colormap color cell and select a color from the Appearancemenu.


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5 Click in the last cell and select a different color.

6 Click in the first cell again, then (still holding down the mouse button) dragacross all cells to the last one - this should highlight all of the cells.


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7 Select Tools > Interpolateto create a smooth gradient of colors betweenthe end points of the selected cells.

8 Select File > Save Asand give the colormap a name.


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The new colormap is saved to the functions folder of your active project and cannow be used.

2Things to Remember You can use as many fixed colors in a colormap as you want, just selectbetween those points and interpolate for smooth colors between. Whenusing more than 10 or 12 colors, a minimum of 3 fixed colors usually givesthe best results.

The first image shows a colormap using 3 fixed points - endpoints and ayellow cell in the middle to force the shading to pass through yellow.


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If the center color was not used, the endpoints interpolated miss out theyellow colors and there is not much variation in the colormap insections. The colormap is not as useful because you cannot distinguishbetween many of the greens by eye.

For a good interpolation between colors, it is best that the two end pointsare not too similar ORdissimilar. The two examples below show once wherethe endpoints are two similar (top colormap) and one where the end pointsare too dissimilar with not enough cells between to make a good smoothinterpolation (bottom colormap).


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Other Colormap Options ..

1Rainbow andGrayscale

Two options under the Tools menu are Rainbow and Grayscale. These are twocolormaps built into Geolog to make it quick and easy to create these colormapsusing your specified Size parameters.

2

Split and Merge Use these options to split a cell, or merge two together.

3Adjust Cell Size The ends of a cell can be adjusted by either one of these methods:

1 Clicking in a cell and typing the new cell range.


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2 Dragging the cell border using the mouse.

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Reverse Use the reverse toggle to invert the current colormap.


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5Functions There are a series of options under the Functions pulldown menu, to allow thefine tuning of a colormap for use with data that may not work well with a linear(Manual) colormap, or when a colormap is required for non-standard needs.

After selecting one of the Functions, you can drag or adjust the shape of thefunction using the small red toggles in the lower section of the Colormap menu.

Here is an example of a Box function in action. This colormap is being used tohighlight a specific value GR range on a xplot.

Colormap in Geolog.pdf

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