Convert GRD to JPEG

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You can certainly apply .grd files to Adobe Photoshop and use the colors in your picture than can be then saved as .jpg picture. This is actually not a file conversion, but more of a workflow to process gradients and use them as colors.

Another possible grd to jpeg conversion, unrelated to the previous one, would be an export of grid files in some of the GIS formats as plain JPEG pictures, which can be done with the help of tools like the Total GIS Converter.

Open GRD file    Open JPEG file