001/* 002Copyright 2006 Jerry Huxtable 003 004Licensed under the Apache License, Version 2.0 (the "License"); 005you may not use this file except in compliance with the License. 006You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010Unless required by applicable law or agreed to in writing, software 011distributed under the License is distributed on an "AS IS" BASIS, 012WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013See the License for the specific language governing permissions and 014limitations under the License. 015*/ 016 017package com.jhlabs.image; 018 019import java.awt.*; 020import java.awt.image.*; 021 022/** 023 * A filter which changes the exposure of an image. 024 */ 025public class ExposureFilter extends TransferFilter { 026 027 private float exposure = 1.0f; 028 029 protected float transferFunction( float f ) { 030 return 1 - (float)Math.exp(-f * exposure); 031 } 032 033 /** 034 * Set the exposure level. 035 * @param exposure the exposure level 036 * @min-value 0 037 * @max-value 5+ 038 * @see #getExposure 039 */ 040 public void setExposure(float exposure) { 041 this.exposure = exposure; 042 initialized = false; 043 } 044 045 /** 046 * Get the exposure level. 047 * @return the exposure level 048 * @see #setExposure 049 */ 050 public float getExposure() { 051 return exposure; 052 } 053 054 public String toString() { 055 return "Colors/Exposure..."; 056 } 057 058} 059