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