create a raster from two rasters with transperency

1411
6
09-15-2016 05:31 PM
LanoYado
New Contributor III

Hi,

I have two raster layers and I want to create another raster by merging them with %50 transparency of the first (top) layer, and the second (down) layer I want it to be %0 transparency. I wondered which tool is the best one for this processing?

Also, how can I save it as a high resolution image so that I can print it later on another computer connected to color printer but does not have ArcGIS installed on?

Thanks

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6 Replies
DanPatterson_Retired
MVP Emeritus

transparency is for symbology Setting layer transparency—Help | ArcGIS for Desktop 

if you want the actual values to be 'added' together in some form, you can use the raster calculator

Raster Calculator—Help | ArcGIS for Desktop with a forumula A*0.5 + B  assuming you just want a straight weighted addition.  Or you can normalize in any way you wish depending on the formula you want to use.

LanoYado
New Contributor III

Thank you Dan, in fact I already used Raster Calculator and created the first top layer with %50 transparency but I have another layer in the bottom I want it to contribute in the over all map and then print it out. Raster Calculator, as you know, does not have transparency like the symbology.

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LanoYado
New Contributor III

This is what I want to be the output. The color comes from the second layer.

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DanPatterson_Retired
MVP Emeritus

that is what I am referring to... you have the option to symbolize... but to combine into one raster, then you have to physically put them together, which is going to produce new numbers and ultimately change your symbology... so what is it you want to do? produce bottom layer A modified by 50% of top layer B? (that is the raster calculator methods I was referring to)

Your image looks fine the way it is... why do you want to make it into one layer? to show somewhere else? screen grab it?

NikosTzelepis
New Contributor

Dear Dan hi, found this old topic while searching for formulas implementing transparency. Assuming we have two grayscale images, does A*0.5+B produces a result equal to 50% transparency? Or, A*0.5+B*0.5 is a more proper one?

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XanderBakker
Esri Esteemed Contributor

How about exporting the dataframe or layout with the raster to a format that the "other" system can handle? See Exporting your map—Help | ArcGIS for Desktop