Let’s start to write our first program to get the idea. This will demonstrate how to. The CImg Library – C++ Template Image Processing Toolkit. FAQ Summary. General information and availability. What is the CImg Library?.

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Class representing an image up to 4 dimensions wideeach pixel being of type T. This is the main class of the CImg Library. It declares and constructs an image, allows access to its pixel values, and is able to perform various image operations. The image grid can have up to 4 dimensions: Usually, the three first dimensions are used to describe spatial coordinates x,y,zwhile the number of channels is rather docmuentation as a vector-valued dimension it may describe the R,G,B color channels for instance.

Concerning the pixel value type T: The default value for the template T is float. Using your own template types may be possible. However, you will certainly have to define the complete set of arithmetic and logical operators for your class. You can access these fields publicly although it is recommended to use the dedicated functions widthheightdepthspectrum and ptr to do so. Image dimensions are not limited to a specific range as long as you got enough available memory.

A value of 1 usually means that the corresponding dimension documetnation flat. If one of the dimensions is 0or if the data pointer is null, the image is considered as empty. Empty images should not contain any pixel data and thus, will not be processed by CImg member functions a CImgInstanceException will be thrown instead.

Pixel data are stored in memory, in a non interlaced mode See How pixel data are stored with CImg. Declaring an image can be done by using one of documentattion several available constructors. Here is a list of the most used:. Some of the most useful are:. Simple const iterator type, to loop through each pixel value of a const image instance. Construct a new image instance with pixels of type Tand initialize pixel values with the data read from an image file. Construct a new image instance with pixels of type Tas a snapshot of an existing CImgDisplay instance.

In-place version of the default constructor CImg.

It simply resets the instance to an empty image. In-place version of the constructor CImg unsigned int,unsigned int,unsigned int,unsigned int. Construct image with specified size and initialize pixel values from a sequence of integers [in-place version]. In-place version of the constructor CImg unsigned int,unsigned int,unsigned int,unsigned int,int,int, Construct image with specified size and initialize pixel values from a sequence of doubles [in-place version].

In-place version of the constructor CImg unsigned int,unsigned int,unsigned int,unsigned int,double,double, Construct image with specified size and initialize pixel values from a value string [in-place version].

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Construct image documentaton specified size and initialize pixel values from a memory buffer [in-place version]. Construct image with dimensions borrowed from another image and initialize pixel values [in-place version]. Transfer the dimensions and the pixel buffer content of an image instance into another one, and replace instance by an empty image.

It avoids the copy of the pixel buffer when possible. Return a reference to a located pixel value of the image instance, being possibly constwhether the image instance is const or not. The returned pointer points on the first value of the image pixel buffer.

The CImg Library Documentation

Add 1 to all image pixels, and return a reference to the current incremented image instance. Add 1 to all image pixels, and return a new copy of the initial pre-incremented image instance. The pixel type cim the returned image may be a superset of the initial pixel type Tif necessary. Replace the image instance by the matrix multiplication between the image instance and the specified matrix img.

Replace the image instance by the right matrix division between the image instance and the specified matrix img. The pixel type of the returned image is T. Public Types List of all members. Construct image with specified size and initialize pixel values from a sequence of integers. Construct image with specified size and dkcumentation pixel values from a sequence of doubles.

Fill pixel values along the X-axis at a specified pixel position. Fill pixel values along the X-axis at a documsntation pixel position [overloading].

documntation Fill pixel values along the Y-axis at a specified pixel position. Fill pixel values along the Y-axis at a specified pixel position [overloading].

Fill pixel values along the Z-axis at a specified pixel position. Fill pixel values along the Z-axis at a specified pixel position [overloading]. Fill pixel values along the C-axis at a specified pixel position. Fill pixel values along the C-axis at a specified pixel position [overloading]. Draw a text string. Draw a text string [overloading]. OFF file [new-instance version]. Image declaration cjmg construction Declaring an image can be done by using one of the several available constructors.

Here is a list of the most used: Construct images from arbitrary dimensions: You may use the function fill to do it, or use the specific constructor taking 5 parameters like this: Construct images from filenames: Construct images from C-style arrays: The complete list of constructors can be found here.

Some of the most useful are: Read or write pixel values. Simple iterator type, to loop through each pixel value of an image instance. Refer to the type of the pixel values of an image instance.

It has been mainly defined for compatibility with STL naming conventions. Note The pixel buffer data is deallocated if necessary, e. Destroying an empty or shared image does nothing actually. Warning When cimf a non-shared image, make sure that you will not operate on a remaining shared image that shares its buffer with the destroyed instance, in order to avoid further invalid memory access to a deallocated buffer.

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Note An empty image has no pixel data and all of its dimensions widthheightdepthspectrum are set to 0as well as its pixel buffer pointer data. An empty image may be re-assigned afterwards, e. In all cases, the type of pixels stays T. An empty image is never shared. Construct image with specified size. Note It is able to create only non-shared images, and allocates thus a pixel documebtation data for each dicumentation image instance.

A CImgInstanceException is thrown when the pixel buffer cannot be allocated e.

c++ – How to use ‘CImg’ and it’s basic functions – Stack Overflow

Warning The allocated pixel buffer is not filled with a default value, and is likely to contain garbage values. In order to initialize pixel values during construction e. Construct image with specified size and initialize pixel values. Note Similar to CImg unsigned int,unsigned int,unsigned int,unsigned intbut it also fills the pixel buffer with documemtation specified value. Warning It cannot be used to construct a vector-valued image and initialize it with vector-valued pixels e.

RGB vector, for color images. For this task, you may use fillC after docmuentation. Note Similar to CImg unsigned int,unsigned int,unsigned int,unsigned intbut it also fills the pixel buffer with a sequence of specified integer values. Otherwise, the constructor may crash or fill your image pixels with garbage. Note Similar to CImg unsigned int,unsigned int,unsigned int,unsigned int,int,int, Otherwise, the constructor may crash or fill your image with garbage.

For instance, the code below will probably crash on most platforms: The two last arguments are ‘int’, not ‘double’! Construct image with specified size and initialize pixel values from a value string. Note Similar to CImg unsigned int,unsigned int,unsigned int,unsigned intbut it also fills the pixel buffer with values described in the value string values. Value string values may describe two different filling processes: Either values is a sequences of values assigned to the image pixels, as in “1,2,3,7,8,2”.

The CImg Library – C++ Template Image Processing Toolkit

A CImgArgumentException is thrown when an invalid value string values is specified. Construct image with specified size and initialize pixel values from a memory buffer. Parameters values Pointer to the input memory buffer. If buffer types T and t are different, a regular static cast is performed during buffer copy. Otherwise, the image instance does cocumentation allocate a new buffer, and uses the input memory buffer as its own pixel buffer.