I like to explain what I did. Out of many pairs of images with NIR and R bands, I selected one pair of NIR and R bands. I created a model using modelbuilder in a step wise fashion. I invoked three times the raster calculator and in the first one I multiplied Red band with 0.0001 and obtained an output. In the second one I multiplied NIR band with 0.0001 with a resultant output. In the third one I used a formula of (NIR-R)/(NIR+R) using the outputs from the earlier two multiplications and I got NDVI image. My intention was to use this model to calculate NDVI from other datasets consisting R and NIR bands. I created a raster catalog with the datasets for iteration. I tried to iterate the process using "raster" iterator. In the dialogue box I showed the raster catalog as source of the rasters and I ran the model after connecting the NDVI output to the Iterator. I could see a lot of processing and got an image with a same name which was given to the raster catalogue, for example 'Test'. I invoked that 'Test' into ArcMap and I could see a stack of layers with some numbers other than NDVI values when I was inquiring and I stopped at this juncture as I do not know what to do. Help is solicited to complete the process correctly so that I can automate the process of creating NDVI images from hundreds of images.