I am trying to export rasters stored in a raster field in a gdb feature class to thumbnail-sized jpg with arcpy. The reason is so that I can attach them to the feature class to be displayed in a popup in ArcGIS online.
If I click on the raster field in ArcMap, the thumbnails are shown, but I am not sure how to export them with arcpy.
The @FelixIP suggestion to resample works well to create thumbnails. Here is a functional snipped to create thumbnails, and add the URL and thumbnail name to a table that could be used to show the thumbnail in AGOL.
#Export Raster to Thumbnail Tif import os import arcpy from arcpy import env rcat = "location of an unmanaged raster catalog" pathsName = "name of output location of a table of raster paths" #Export raster catalog paths to dbf table arcpy.ExportRasterCatalogPaths_management(rCat, "ALL", pathsName) # Add fields to store some useful fields to help manage thumbnail paths arcpy.AddField_management(pathsName, "thumbURL", "TEXT", field_length=500) arcpy.AddField_management(pathsName, "rasName", "TEXT", field_length=100) #Use data access cursor to loop through table and create thumbnails with arcpy.da.UpdateCursor(pathsName, seColumns) as cursor: for row in cursor: #Assign the raster path to a variable from the table rasPath = str(row) #assign input raster name to a variable inName = arcpy.Describe(rasPath).name #Create a URL for the thumbnail to be stored later tURL = "web server location" + inName + ".png" #Write thumbnail URL and raster name row = tURL row = inName #update the rows cursor.updateRow(row) #Create thumbnail to send to web outThumbLoc = 'tumbnail storage folder' #Create thumbnail name outThumb = os.path.join(outThumbLoc, inName + ".png") #Use resample to create thumbnails try: arcpy.Resample_management(rasPath, outThumb, tScale, "BILINEAR") except Exception as err: print rasPath print(err.args)