GIFSICLE MERGE HOW TO
GIFSICLE MERGE CODE

One way to see the 2nd image (if it is covered by the 1st image) - besides using the 'flash' feature - is to set the weighting factor to 1.0 and click on the 'Merge' button - to get an image like the following. In this case, the 'flash' feature was handy to be able to confirm the alignment of the two images, according to the 'center' radiobutton.Īfter clicking on the 'Merge' button, within about 1 second, one gets a merged image, like the following. In the sample image above, the second image was bigger (both horizontally and vertically) than the first image.Īlthough the user can see the 'image1' when it is loaded to the canvas - because there is a pause of about 1 second before loading 'image2' - the 2nd image, in this case, then completely hides the first. Thus the user can see the 'common merge rectangle' of each image - whose pixels will be averaged together to get the merged image.)Īdjust the setting of the 'weight' slider and click on the 'Merge' button to cause the merge (which occurs in about one second).Įxperiment with the 'weight' slider and the 'Merge' button to see the effect of weighting image1 more or less relative to image2. (The 2nd image may completely cover the first, so to be able to check the alignment of the 2 images, the user can CLICK ANYWHERE ON THE CANVAS to cause the 2 images to 'flash' over-under each other several times. The images will be located on the canvas according to the user-selected 'alignment' option. (If the 2 images are the same size, any of the choices should yield the same result.)Īs indicated in a brief 'guide' on the GUI, the user can 'right-click' (with mouse-button-3) on EITHER filename entry field to cause the 2 image files to be read and their images shown on the 'canvas'. With the 'alignment' radiobuttons on the GUI, select a 'compass point' which will be used to align the 2 images with respect to each other. This is most conveniently done with the 'Browse.' buttons on the GUI. TYPICAL SEQUENCE OF OPERATIONS WITH THE GUI And there is a 'scale' widget on the GUI to easily set the weighting factor. Note that there are nine 'compass-point' radiobuttons that allow the user to quickly specify a method-of-alignment. I ended up with the GUI seen in the following image.

On the basis of the goals above, which implied the need for widgets on the GUI to

GIFSICLE MERGE CODE

So, in the code below, I have not included code to handle transparency information in either image file. I am currently not concerned with handling transparency in GIF and PNG images. My main goals for the Tcl-Tk script were:ġ) Provide a GUI for selecting two image files.Ģ) Provide the user a way to easily select a weighting factor for merging the 2 images.ģ) Allow the 2 images to be of different sizes - and provide the user a simple way to 'align' the 2 images. I returned to the script and started-and-finished the coding-and-testing of the procs for the script this month (about 7 months later, 2014 March) - and that code is presented below. I set the script aside as I worked on other Tk scripts. I started the GUI for that script in August 2013. I have had a 'merge-two-images' Tk script (with GUI control widgets) on my 'to do' list - at the bottom of my 'bio' page uniquename - for about a year now. In fact the GUI consisted only of a canvas holding the new image - no buttons, no entry fields, no controls of any kind on the GUI. In other words, there is no flexibility in the alignment of the 2 images.įurthermore, the weighting factor for merging the two images was hard-coded. The names of two test GIF files were hard-coded in the code.Īlthough he allowed for the two images to be of different sizes, the code reveals that the two images are merged by 'aligning' the 2 rectangular images with their top-left corners matched-up. However, in his 'demo' code, 'ulis' did not offer a file selector GUI. I thought I might find it handy to have a utility that merges two images - images in JPEG and PNG files, as well as GIF files.

System.fun(ifelse(.Platform$OS.In 2003, ulis provided Tcl-Tk code on a wiki page titled Merging images with transparency. If(show) message('Executing: ', strwrap(command, exdent = 2, prefix = ' ')) System.fun <- if (.Platform$OS.type = 'windows') shell else system Gif_compress('file.gif', 'outfile.gif', extra.opts='-colors 256'))Īnd their code is given below: gif_append %s', extra.opts, ingif, outgif) Gif_append('file1.gif', 'file2.gif', 'outfile.gif', delay=4)

GIFSICLE MERGE HOW TO

Here are two examples of my functions, they should be enough to understand how to use them: gif_append('file1.gif', 'file2.gif', 'outfile.gif', horizontal=FALSE, extra.opts='-resize 300x400') Moreover, since I usually use the animation package to create my animations, these functions provide additional tools. I wrote some R functions to run them more conveniently (at least, for R users). Obviously, the previous command lines are not user-friendly.

Gifsicle merge