Image processing apparatus and control method thereof

Abstract

An image processing apparatus comprises a recording image generation unit which generates recording image data from image data input by an image input unit, based on a first gamma characteristic; a display image generation unit which generates display image data from the image data based on a second gamma characteristic in correspondence with a characteristic of a display unit; a determination unit which determines whether or not the recording image data includes a portion of luminance levels which are not less than a predetermined threshold; a display data generation unit which generates display data for indicating the portion of the luminance levels which are not less than the predetermined threshold; and a display control unit which superimposes the display data on the display image data.

What is claimed is: 
     
       1. An image processing apparatus comprising:
 a recording image generation unit configured to generate recording image data from image data input by an image input unit, based on a first gamma characteristic; 
 a display image generation unit configured to generate display image data from the image data based on a second gamma characteristic, a latitude of which is narrower than the first gamma characteristic, 
 wherein the display image data includes a portion in which tones of the recording image data are not reproduced due to the second gamma characteristic is narrower than the first gamma characteristic; and 
 a display unit configured to superimpose display data for indicating that tones cannot be expressed on a portion in which tones of the recording image data cannot be reproduced and in which tones cannot be expressed even in the recording image data in the display image data. 
 
     
     
       2. The apparatus according to  claim 1 , further comprising
 a storage unit configured to store a plurality of different gamma characteristics as the first gamma characteristic; and 
 an operation unit configured to accept an operation input from a user, 
 wherein the first gamma characteristic is arbitrarily selectable from the plurality of gamma characteristics according to an operation input to said operation unit. 
 
     
     
       3. The apparatus according to  claim 1 , further comprising a selection unit configured to select one of the recording image data and the display image data, and to output the selected image data to the display unit. 
     
     
       4. The apparatus according to  claim 1 , wherein the display data superimposed in the display image data is zebra pattern. 
     
     
       5. A control method of an image processing apparatus, the method comprising the steps of:
 generating recording image data from image data input by an image input unit, based on a first gamma characteristic; 
 generating display image data from the image data based on a second gamma characteristic, a latitude of which is narrower than the first gamma characteristic, 
 wherein the display image data includes a portion in which tones of the recording image data are not reproduced due to the second gamma characteristic is narrower than the first gamma characteristic; and 
 superimposing display data for indicating that tones cannot be expressed on a portion in which tones of the recording image data cannot be reproduced and in which tones cannot be expressed even in the recording image data in the display image data. 
 
     
     
       6. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method of an image processing apparatus, the method comprising the steps of:
 generating recording image data from image data input by an image input unit, based on a first gamma characteristic; 
 generating display image data from the image data based on a second gamma characteristic, a latitude of which is narrower than the first gamma characteristic, 
 wherein the display image data includes a portion in which tones of the recording image data are not reproduced due to the second gamma characteristic is narrower than the first gamma characteristic; and 
 superimposing display data for indicating that tones cannot be expressed on a portion in which tones of the recording image data cannot be reproduced and in which tones cannot be expressed even in the recording image data in the display image data.