1 COMBINE Add, multiply, divide, etc... two input images COMBINE This task makes "combinations" of two input images to produce a third one. The two input images may have the same dimensions, or the first one (Z one) may have less dimensions than the second (Y) one. In the latter case, combinations will occur for all the extra planes of the Y image. For example you can divide all planes of an input (Y) 3-D cube by a 2-D (Z) image, provided each plane of the cube matches the single image... Operations are ADD X = Ay*Y + Az*Z + C MULTIPLY X = AY*Y * AZ*Z + C DIVIDE X = AY*Y / AZ*Z + C OPTICAL_DEPTH X = - LOG (AY*Y / AZ*Z + C) provided Y > TY and Z > TZ , TY and TZ being thersholds for the Y and Z images. Image combinations may also be done using the SIC arithmetic ca- pabilities, but COMBINE offers the advantage of handling correctly blanking information. 2 Z_NAME\$ TASK\FILE "First input map" Z_NAME\$ This is the name of the input map with the smaller number of dimensions. 2 Z_FACTOR\$ TASK\REAL "Scaling factor" Z_FACTOR\$ This is a scaling factor for map Z_NAME\$. 2 Z_MIN\$ TASK\REAL "Threshold" Z_MIN\$ This is a threshold on map Z_NAME\$. For all values below this threshold, the output image will be blanked. 2 Y_NAME\$ TASK\FILE "Second input map" Y_NAME\$ This is the name of the input map with the larger number of dimensions. 2 Y_FACTOR\$ TASK\REAL "Scaling factor" Y_FACTOR\$ This is a scaling factor for map Y_NAME\$. 2 Y_MIN\$ TASK\REAL "Threshold" Y_MIN\$ This is a threshold on map Y_NAME\$. For all values of Y below this threshold, the output image will be blanked. 2 X_NAME\$ TASK\FILE "Output map" X_NAME\$ This is the name of the output map. 2 BLANKING\$ TASK\REAL "New blanking value" BLANKING\$ This is the blanking value chosen for the output map. 2 OFFSET\$ TASK\REAL "Output offset" OFFSET\$ This is an offset added to the output map. 2 FUNCTION\$ TASK\CHARACTER "Function" FUNCTION\$ Selected operation. Possible operations are ADD, MULTIPLY, DIVIDE (Y by Z), and OPTICAL_DEPTH (-Log(DIVIDE)). 1 ENDOFHELP