However, the result may be a window of the wrong size or location on the screen. Will display an image in the active window or open a new window if there is no active window.
How to change cursor color in idl tv#
The image display procedures, TV and TVSCL that are discussed below The Query_xxx functions are particularly useful in cases where you want to avoid trying There is a Query_Gif function, and a similar function for each imageįormat that IDL understands. Image file by using a Query_xxx function. Sometimes you want information about an image before attempting to read it.
The Read_Gif command, for example, lets you load the color table into three color variables. If an image file contains a color table for that image, then it makes sense to use it when displaying the image The Read_GifĬommand can read the color table from the image.gif file if it exists. It will use the current IDL color table, so it may not look exactly like the original image. The image can now be displayed as describedīelow. In this example, image is a byte array with 716 columns and 567 rows. You can get information by using the Help The array image will now be an array of bytes. You can do theįollowing: IDL> fname=Dialog_Pickfile(FILTER='*.gif')
How to change cursor color in idl full#
The added advantage that it will construct a full file name for whatever machine is being used. I find it handy to use the Dialog_Pickfile function to help me pick the full name of the image file. For simplicity, we will discuss only the Read_Gif procedure. Each procedure has keyword parameters to set. The supported formats in IDL version 5.2 include: BMP, DICOM, GIF, JPEG, PICT, PNG, PPM, SRF, Look in the IDL Help index forįurther information. IDL provides routines of the form Read_xxx to read a number of image formats.
Named image by executing the command IDL> Read_Gif,'C:\myimages\scene.gif',image If the directory is named myimages on the C drive then you could read the image into an array In a directory then you can read it by supplying the path to the image to the Read_Gif For example, if you have an image named scene.gif Image data can be read from files in several formats.
We will enlarge this toolbox as we go along in the course. To get you started with a basic set of tools. IDL provides many tools for displaying, modifying and analyzing images.
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