Mosaic Tutorial

In this tutorial, you'll mosaic several images of different coordinate systems together to create one image that contains a projected coordinate system.

1.In Adobe Photoshop, open the Americas_1.tif, Americas_2.tif, Americas_3.tif and Americas_4.tif files from the \Tutorial Data\Americas folder.

2.On the Americas_4.tif document, click the Reference file Specify link on the Geographic Imager panel. Choose Americas_4_reference.tfw, and click Open.

The Reference file is loaded, but the Americas_4 document still needs coordinate system information.

3.Click the Coordinate System Specify link on the Geographic Imager panel, click the Same As check box and choose Americas_1.tif (WGS 84) from the drop-down list.

4.Click OK.

5.Make the Americas_2.tif the active document and click the Mosaic button on the Geographic Imager panel.

Notice that Americas_2.tif is in the Lambert Conformal Conic projected coordinate system. It will be the destination document, meaning other images will be transformed to the same coordinate system and then mosaicked. Available documents can have different coordinate systems, different pixel sizes or contain rotation and still be mosaicked. The images will inherit the coordinate system and pixel size of the destination document.

 Transformations during mosaic are not supported when the destination document contains a rotation. To mosaic into a destination document containing rotation the images to be mosaicked must have the same coordinate system, pixel size and rotation angle.

A list of available documents for mosaicking are displayed in the Available Documents list of the Mosaic dialog box. You will specify the Mosaic Documents next.

5.Click the Transfer All button to move all available documents into the Mosaic Documents list.

6.Click the Layer pre-processing drop-down and choose Leave intact.

The Advanced Transformation Options allow you to resample documents, set strip size, and leave the layers intact or merge them.

7.Click OK to begin processing the mosaic.

The image is mosaicked in the Americas_2.tif document in a Lambert Conformal Conic projected coordinate system.

Inspect the Adobe Photoshop Layers panel. Notice that the other documents are now mosaicked in the Americas_2.tif document. The layers are kept intact because you specified it to be with the Keep source data on separate layers option. You can individually make layers visible or invisible or lock them. This makes for image editing more flexible. To flatten the entire image, choose Layer > Flatten Image.