function is ideal when you work with amateur portrait photographs. Figure 26.5 Pixelized secret agent The G imp Us e r’s Man u al 4 0 7 C h a p ter 2 6 TILEABLE BLUR Tileable Blur is an excellent resemblance to the template image. C H A P T E R29 Cryptographic Filters So, you want to be a secret agent? You may want to use these filters to encrypt and hide your information. 454 T h e G i m p Us er