Some multispectral images may be provided as a single image that stores extra channels (called alpha channels in Adobe Photoshop). Healthy vegetation shows in bright green colour. Sand, soil and minerals appear in variety of colour. It provides clear imagery in desert region. Sand, soil and minerals show in multitude of colour. The bright red areas at the top of the image belong to the prestigious Rosedale Golf Club.

The brighter the red, the healthier the vegetation. The band combination chosen makes vegetation appear in shades of red because vegetation reflects a lot of near infrared light.

Red: Band 4 (Near Infrared), 30 meters.tifĪ reference file called Untitled-x.tfw (the x value may change depending on if you have other reference files named something similar) is created in the default reference format specified in the Geographic Imager Preferences dialog box.Ī false-colour composite image with georeferencing is created.

In the Merge RGB Channels dialog box specify the following channels: In the Merge Channels dialog box, choose RGB Color in the Mode drop-down list and ensure there are 3 channels. In any of the active document windows, click Merge Channels in the Channels panel options menu.Ĥ. From the Windows menu, choose Channels to open the Channels panel.ģ. If the images need to be cropped, it is recommended to use the Geographic Imager GeoCrop function to assure that the extents of the images remain consistent.Ģ. When creating false-colour composites, images must be of the same image resolution and have the same spatial extents. In Adobe Photoshop, browse to the Landsat 7 Multispectral folder and open the following images: You may easily identify distinct features by their unique spectral signature.ġ. The Adobe Photoshop function called Merge Channels merges images to create false-colour or true-colour composites.

These images need to be combined into one image.

Often multispectral satellite images will consist of several grayscale images, with each image containing one of the wavelengths or bands of the electromagnetic spectrum. This tutorial will create a false-colour composite of downtown Toronto and surrounding suburban areas. To use this information, the wavelengths outside the visible spectrum need to be reassigned to the visible spectrum so that it is visible to the human eye. Multispectral images contain information inside and outside the visible electromagnetic spectrum. Another powerful remote sensing tool in Adobe Photoshop is the ability to create a false-colour composite image.

Merge two photos in photoshop 7