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c create image 1 1 -anchor nw -image pictureĪfter creation, you can draw and manipulate any canvas object you wish just as if it were floating upon myimage. Check out the photo man page for details.Ī good way to both see the image and allow some manipulation is to treat it as a “canvas object”: canvas. It is possible to specify the size of the color cube of a given image (you can even explicitly impose it to be gray-scale), its gamma correction and some other nifty things. The copied portion can be placed anywhere inside the destination image. You can also create a second image, and copy a section of the first one into the second: image create photo pic_pieceĭuring the copy you can use the Tk options subsample or zoom to reduce the image or enlarge a portion of it. For example, to get its dimensions: set pic_wid Let’s focus on the “photo” type, which was implemented by Paul Mackerras based on his earlier “photo widget”.Ī command for creating an image object named “picture” with the image in the file “mickey.gif” would be: image create photo picture -file mickey.gifĪfter its creation we can easily do some operations. While bitmaps deal only with foreground and background colors, photos treat true-color objects, automatically quantizing for the available number of colors in the display. Images can be of two different types: bitmaps and photos. The idea is to create an “image object” with an associated command, just like any normal widget.
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The very fabric of our program is based on the image primitive, which first appeared in Tk version 4.0. While this method has many advantages, e.g., straightforward implementation and memory saving when using static libraries, it does present some limitations:
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In Linux Journal #10 (February, 1995) Matt Welsh wrote a nice article describing a way to use Tcl/Tk as a front end for C programs using pipes to and from a wish process. So we’ll use a mixture of Tcl and Tk with C, and get the best of both worlds. However, it should be noted that some operations on images are computationally intensive, making the use of Tcl prohibitively expensive. In this article, we’ll show you how Tcl and Tk can help you in dealing with these problems easily. The interface design and implementation is also difficult, due to the need for dealing with issues such as color allocation, quantization and so on. It is necessary not only to develop an internal data structure, but also to write the filters for reading and writing the available graphic formats. To start an implementation in C from scratch for an image processing (or manipulation) program is a difficult task.