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The image now has a transparent background:

http://www.edcollins.com/rg.htm

Please note that a few pixels around the edges should be cleaned up.

This is how to save it in GIMP: Click File > Export > give your file a new name, choose PNG from the file type dropdown.

By the way you do not need to do this for printing T-shirts. A regular JPEG without transparency will do.

Printing on T-shirts is normally done using screen printing. So all you need to give the printers is a black and white image of the artwork, and tell them you want the logo printed in white. A solid black logo would do (on a white background). So all you need to do is invert the image. In GIMP click Colours > Invert.

This will allow the screen printer to create a screen, which they will then print using opaque white ink onto the black T-shirt. In your image, areas that are white (the background) will not be printed. The white ink will only be transferred through the screen to areas in the artwork that are black.

In a sparkling photograph, one shade is obvious. in the occasion, white is this shade. an basic thank you to make a image sparkling is to apply LView professional. Open the non-sparkling photograph. opt for Retouch, background shade from the menu. click on the Dropper button. The mouse pointer will become a dropper. click as quickly as on the section you should make sparkling. shop the image in GIF 89a format. it is likewise fairly basic in Paint shop professional V4.a million. Open or create the photograph to alter into sparkling. Press the Dropper icon in the image equipment toolbar and good-click the section to alter into sparkling. This transformations the background shade to the sparkling shade. opt for document, shop As. opt for GIF - CompuServe and on of the version 89a codecs in the two comboboxes. Press the strategies button and choose the third radiobutton: Set the transparency fee to the background shade Press ok, ok and the image is obvious.