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- interp - gamma-corrected color ramp generator
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- _I_n_t_e_r_p makes smooth color ranges. Two color chips and a Gouraud-shaded
- polygon showing the shade range between them are displayed. To make a
- color range, start windows for _s_h_o_w_m_a_p, _c_e_d_i_t, and _i_n_t_e_r_p. Select the
- color at the lower (usually darker) end of the shade range and use _c_e_d_i_t
- to set it to the desired value. Select the color at the top of the shade
- range and edit it as well.
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- Now attach to (select) _i_n_t_e_r_p. Point to the lower color (usually on
- _s_h_o_w_m_a_p). Press and release the left mouse button. Point to the high
- color and repeat. Both the extreme colors of your desired color ramp
- should be in the two large color chips in the _i_n_t_e_r_p window. If you
- should make an error when selecting the extreme colors for your ramp,
- just keep trying to use the left mouse button to pick the colors, until
- the two color chips show the proper extreme color indices.
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- When the extreme color indices are correctly chosen (which is reflected
- in the color chips), the other colors of the ramp can be interpolated.
- While _i_n_t_e_r_p is still selected for input, press and release the middle
- mouse button. This interpolates all the colors between the extreme
- colors.
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- The resultant color array will be gamma-corrected using the floating-
- point constant in ~/._g_a_m_m_a. If no such file exists, the gamma constant
- is 1.0.
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- This program must have input focus in order to work properly. See the
- window manager documentation for a discussion of input focus.
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