Photoshop 6 for Windows Bible- P33:If you are reading this foreword, it probably means that you’ve purchased a copy of Adobe Photoshop , and for that I and the rest of the Photoshop team at Adobe thank you. If you own a previous edition of the Photoshop Bible, you probably know what to expect. If not, then get ready for an interesting trip. | Chapter A Constructing Homemade Effects 41 Distorto 10 Distorto 40 Distorto 140 Figure A-45 The top row shows three different applications of the Rotator filter with the Red Green and Blue slider bars set to various positions. The Distorto option was set to 0. In the bottom examples I added a cranked up Distorto value to each of the rotations above. That s gotta hurt. STEPS Creating a Filter Inside the Factory 1. Open an RGB image or convert some other image to the RGB mode. This filter yields interesting results even when applied to grayscale images converted to RGB. 2. Choose Filter SyntheticFactory. Set all the slider bars back to 0 just in case somebody s been fooling around with them. 3. Enter rad d- 4 ctl 0 m 0 into the R option box. The first argument in the expression d- 4 ctl 0 subtracts four times the value of the top slider bar from the angle variable d. Why four times Because the slider only offers 256 increments and the filter measures a full circle in 1 024 increments 256 times 4 equals 1 024 thus enabling you to translate the slider values to a full circle. 42 Extra Reading Photoshop 6 for Windows Bible Meanwhile dis the angle of the current pixel from the center and m is the distance from the pixel to the center. So rad d- 4 ctl 0 m 0 tells the filter to lift the brightness from the pixel in a counterclockwise direction from the PBE. The result is that the red channel rotates in the opposite direction clockwise. Drag the slider bar and you ll see that this is true. 4. Insert the phrase -ctl 4 2 after the m so that the expression reads rad d- 4 ctl 0 m-ctl 4 2 0 . You ll use the second and third slider bars ctl 1 and ctl 2 for rotating the other two channels. But I think that I d like to use the fifth slider bar for distorting the image. Why not the fourth channel Well because the first three sliders are going to be devoted to rotation. The distortion slider will be logically different so it might be nice to create a blank space between the rotation
