animgif frontend zip date 2021-04-02T19:34:41+03:00
I am nostalgic about those times when there was no, or at least much less black hat content on the internet. Search engines were as they were, but the results were valid. Free software was free, developed by developers, and the notion of bundleware, crapware, bloatware were like unknown. Today? Trojans, spyware and spamdexing wherever you look. This pisses me off, and this is the reason I wrote this article and developed the free software.
Same black hat sh*t when we try to find an animgif creator – yes, a free one. Be it a converter from video or still frames. Best case scenario: you get to look at ads and ads and ads, you get a burnt in logo on your gif etc. Worst case scenario: you get some bundleware, crapware or spyware. Nice tracking softwares for ad servers or you might find that your computer is actually mining bitcoins in the background.
Why animgif? Suppose I want to show you how bad the seeing was when I imaged Saturn. Should I upload a youtube clip? No: I wanted a GIF. Or suppose I want to show you a sunset with sunspots. Or the transit of Venus, recorded by myself. Because the treasures of astronomy are worthless if they are not shared. Science and hobby sciences are ment to be shared.
So after a while I decided to use the free ImageMagick + ffmpeg software collection. Both have a command line interface – no gui – to which Linux users might be much more used to. Under Windows, well, it worth learning. Or using my frontend (further down).
1) extract still frames from an arbitrary video file
2) create an animated gif – animgif – from arbitrary still frames
1) Extracting frames from a video: ffmpeg. The ffmpeg software library emarges in various places on the internet. It stands at the core of many applications. One might download it individually, but ImageMagick brings it along. I use this command:
ffmpeg is the name of the program. On my computer it looks like: C:ffmpeg-20131205-git-9ca32b2-win32-staticbinffmpeg.exe
-i this tells ffmpeg to extract frames
video.avi the path and filename of the video file to be processed. In this case I just put it in the same folder.
-qscale 0 this would be a very long story. Lets just say this keeps each frame at a high quality.
frame%03d.jpg path and filename of the output files. In this case it is the same folder, next to the ffmpeg.exe. Red marks the filename lead, yellow the integer counter with three digits, and lime is the file extension. JPG is a lossy image compression format but since the goal is to create a lossy animgif (gif: 256 colors, jpeg: 16m colors) we are safe.
2) Creating the animgif from still frames: ImageMagick. It is free software standing at the core of many image processing softwares. It brings ffmpeg along and can be downloaded from this link. It is very very robust. To get a sense of just how robust, I printed the help of convert (convert >a.txt). No program for ordinary users.
Version: ImageMagick 6.8.8-2 Q8 x86 2014-01-09 http://www.imagemagick.org Copyright: Copyright (C) 1999-2014 ImageMagick Studio LLC Features: DPC OpenMP Delegates: bzlib cairo freetype jbig jng jp2 jpeg lcms lqr pangocairo png ps rsvg tiff webp xml zlib Usage: convert.exe [options ...] file [ [options ...] file ...] [options ...] file Image Settings: -adjoin join images into a single multi-image file -affine matrix affine transform matrix -alpha option activate, deactivate, reset, or set the alpha channel -antialias remove pixel-aliasing -authenticate password decipher image with this password -attenuate value lessen (or intensify) when adding noise to an image -background color background color -bias value add bias when convolving an image -black-point-compensation use black point compensation -blue-primary point chromaticity blue primary point -bordercolor color border color -caption string assign a caption to an image -channel type apply option to select image channels -clip-mask filename associate a clip mask with the image -colors value preferred number of colors in the image -colorspace type alternate image colorspace -comment string annotate image with comment -compose operator set image composite operator -compress type type of pixel compression when writing the image -define format:option define one or more image format options -delay value display the next image after pausing -density geometry horizontal and vertical density of the image -depth value image depth -direction type render text right-to-left or left-to-right -display server get image or font from this X server -dispose method layer disposal method -dither method apply error diffusion to image -encoding type text encoding type -endian type endianness (MSB or LSB) of the image -family name render text with this font family -fill color color to use when filling a graphic primitive -filter type use this filter when resizing an image -font name render text with this font -format "string" output formatted image characteristics -fuzz distance colors within this distance are considered equal -gravity type horizontal and vertical text placement -green-primary point chromaticity green primary point -intensity method method to generate intensity value from pixel -intent type type of rendering intent when managing the image color -interlace type type of image interlacing scheme -interline-spacing value set the space between two text lines -interpolate method pixel color interpolation method -interword-spacing value set the space between two words -kerning value set the space between two letters -label string assign a label to an image -limit type value pixel cache resource limit -loop iterations add Netscape loop extension to your GIF animation -mask filename associate a mask with the image -matte store matte channel if the image has one -mattecolor color frame color -moments report image moments -monitor monitor progress -orient type image orientation -page geometry size and location of an image canvas (setting) -ping efficiently determine image attributes -pointsize value font point size -precision value maximum number of significant digits to print -preview type image preview type -quality value JPEG/MIFF/PNG compression level -quiet suppress all warning messages -red-primary point chromaticity red primary point -regard-warnings pay attention to warning messages -remap filename transform image colors to match this set of colors -respect-parentheses settings remain in effect until parenthesis boundary -sampling-factor geometry horizontal and vertical sampling factor -scene value image scene number -seed value seed a new sequence of pseudo-random numbers -size geometry width and height of image -stretch type render text with this font stretch -stroke color graphic primitive stroke color -strokewidth value graphic primitive stroke width -style type render text with this font style -support factor resize support: > 1.0 is blurry, < 1.0 is sharp -synchronize synchronize image to storage device -taint declare the image as modified -texture filename name of texture to tile onto the image background -tile-offset geometry tile offset -treedepth value color tree depth -transparent-color color transparent color -undercolor color annotation bounding box color -units type the units of image resolution -verbose print detailed information about the image -view FlashPix viewing transforms -virtual-pixel method virtual pixel access method -weight type render text with this font weight -white-point point chromaticity white point Image Operators: -adaptive-blur geometry adaptively blur pixels; decrease effect near edges -adaptive-resize geometry adaptively resize image using 'mesh' interpolation -adaptive-sharpen geometry adaptively sharpen pixels; increase effect near edges -alpha option on, activate, off, deactivate, set, opaque, copy transparent, extract, background, or shape -annotate geometry text annotate the image with text -auto-gamma automagically adjust gamma level of image -auto-level automagically adjust color levels of image -auto-orient automagically orient (rotate) image -bench iterations measure performance -black-threshold value force all pixels below the threshold into black -blue-shift factor simulate a scene at nighttime in the moonlight -blur geometry reduce image noise and reduce detail levels -border geometry surround image with a border of color -bordercolor color border color -brightness-contrast geometry improve brightness / contrast of the image -cdl filename color correct with a color decision list -charcoal radius simulate a charcoal drawing -chop geometry remove pixels from the image interior -clamp keep pixel values in range (0-QuantumRange) -clip clip along the first path from the 8BIM profile -clip-path id clip along a named path from the 8BIM profile -colorize value colorize the image with the fill color -color-matrix matrix apply color correction to the image -contrast enhance or reduce the image contrast -contrast-stretch geometry improve contrast by `stretching' the intensity range -convolve coefficients apply a convolution kernel to the image -cycle amount cycle the image colormap -decipher filename convert cipher pixels to plain pixels -deskew threshold straighten an image -despeckle reduce the speckles within an image -distort method args distort images according to given method ad args -draw string annotate the image with a graphic primitive -edge radius apply a filter to detect edges in the image -encipher filename convert plain pixels to cipher pixels -emboss radius emboss an image -enhance apply a digital filter to enhance a noisy image -equalize perform histogram equalization to an image -evaluate operator value evaluate an arithmetic, relational, or logical expression -extent geometry set the image size -extract geometry extract area from image -features distance analyze image features (e.g. contrast, correlation) -fft implements the discrete Fourier transform (DFT) -flip flip image vertically -floodfill geometry color floodfill the image with color -flop flop image horizontally -frame geometry surround image with an ornamental border -function name parameters apply function over image values -gamma value level of gamma correction -gaussian-blur geometry reduce image noise and reduce detail levels -geometry geometry preferred size or location of the image -grayscale method convert image to grayscale -identify identify the format and characteristics of the image -ift implements the inverse discrete Fourier transform (DFT) -implode amount implode image pixels about the center -interpolative-resize geometry resize image using 'point sampled' interpolation -lat geometry local adaptive thresholding -level value adjust the level of image contrast -level-colors color,color level image with the given colors -linear-stretch geometry improve contrast by `stretching with saturation' -liquid-rescale geometry rescale image with seam-carving -magnify double the size of the image with pixel art scaling -median geometry apply a median filter to the image -mode geometry make each pixel the 'predominant color' of the neighborhood -modulate value vary the brightness, saturation, and hue -monochrome transform image to black and white -morphology method kernel apply a morphology method to the image -motion-blur geometry simulate motion blur -negate replace every pixel with its complementary color -noise geometry add or reduce noise in an image -normalize transform image to span the full range of colors -opaque color change this color to the fill color -ordered-dither NxN add a noise pattern to the image with specific amplitudes -paint radius simulate an oil painting -perceptible epsilon pixel value less than |epsilon| become epsilon or -epsilon -polaroid angle simulate a Polaroid picture -posterize levels reduce the image to a limited number of color levels -profile filename add, delete, or apply an image profile -quantize colorspace reduce colors in this colorspace -radial-blur angle radial blur the image -raise value lighten/darken image edges to create a 3-D effect -random-threshold low,high random threshold the image -region geometry apply options to a portion of the image -render render vector graphics -repage geometry size and location of an image canvas -resample geometry change the resolution of an image -resize geometry resize the image -roll geometry roll an image vertically or horizontally -rotate degrees apply Paeth rotation to the image -sample geometry scale image with pixel sampling -scale geometry scale the image -segment values segment an image -selective-blur geometry selectively blur pixels within a contrast threshold -sepia-tone threshold simulate a sepia-toned photo -set property value set an image property -shade degrees shade the image using a distant light source -shadow geometry simulate an image shadow -sharpen geometry sharpen the image -shave geometry shave pixels from the image edges -shear geometry slide one edge of the image along the X or Y axis -sigmoidal-contrast geometry increase the contrast without saturating highlights or shadows -sketch geometry simulate a pencil sketch -solarize threshold negate all pixels above the threshold level -sparse-color method args fill in a image based on a few color points -splice geometry splice the background color into the image -spread radius displace image pixels by a random amount -statistic type geometry replace each pixel with corresponding statistic from the neighborhood -strip strip image of all profiles and comments -swirl degrees swirl image pixels about the center -threshold value threshold the image -thumbnail geometry create a thumbnail of the image -tile filename tile image when filling a graphic primitive -tint value tint the image with the fill color -transform affine transform image -transparent color make this color transparent within the image -transpose flip image vertically and rotate 90 degrees -transverse flop image horizontally and rotate 270 degrees -trim trim image edges -type type image type -unique-colors discard all but one of any pixel color -unsharp geometry sharpen the image -vignette geometry soften the edges of the image in vignette style -wave geometry alter an image along a sine wave -white-threshold value force all pixels above the threshold into white Image Sequence Operators: -append append an image sequence -clut apply a color lookup table to the image -coalesce merge a sequence of images -combine combine a sequence of images -compare mathematically and visually annotate the difference between an image and its reconstruction -complex operator perform complex mathematics on an image sequence -composite composite image -crop geometry cut out a rectangular region of the image -deconstruct break down an image sequence into constituent parts -evaluate-sequence operator evaluate an arithmetic, relational, or logical expression -flatten flatten a sequence of images -fx expression apply mathematical expression to an image channel(s) -hald-clut apply a Hald color lookup table to the image -layers method optimize, merge, or compare image layers -morph value morph an image sequence -mosaic create a mosaic from an image sequence -poly terms build a polynomial from the image sequence and the corresponding terms (coefficients and degree pairs). -print string interpret string and print to console -process arguments process the image with a custom image filter -separate separate an image channel into a grayscale image -smush geometry smush an image sequence together -write filename write images to this file Image Stack Operators: -clone indexes clone an image -delete indexes delete the image from the image sequence -duplicate count,indexes duplicate an image one or more times -insert index insert last image into the image sequence -reverse reverse image sequence -swap indexes swap two images in the image sequence Miscellaneous Options: -debug events display copious debugging information -distribute-cache port distributed pixel cache spanning one or more servers -help print program options -list type print a list of supported option arguments -log format format of debugging information -version print version information By default, the image format of `file' is determined by its magic number. To specify a particular image format, precede the filename with an image format name and a colon (i.e. ps:image) or specify the image type as the filename suffix (i.e. image.ps). Specify 'file' as '-' for standard input or output.
I usually use this command:
convert Is the imagemagick program doing the job. On my computer this is located at: C:Program FilesImageMagick-6.8.8-Q8convert.exe .
-fuzz 4% This tells the program to do some compression: within a 4% boundary treat colors as the same. Huge gifs are nonsense.
-delay 1×30 This gives the speed of the animation in frames/sec. Rendering large images can be expensive in terms of processing power, so browsers might limit this number to what a human can see: about 25 or 30 frames/sec. Coincidentally, 30fps is the speed at which my webcam recorded Saturn.
input2*.jpg These are the input frames. I put them here to save the trouble of giving a long path as an argument in the command line. I will relocate them when I am done.
-coalesce Necessary for the animation to be fluid.
-layers OptimizeTransparency Some times useful, some times not. When it helps it reduces filesize by keeping pixels from the previous frames.
outputanimacio.gif The output file in the folder I created for this purpose.
So my goal was to show how bad the seeing was on July 19th 2013 when I imaged Saturn.
About the frontend
Now imagine I got bored typing all the commands. There may be (somewhere in plain sight or buried deep within an obscure linux forum) frontends that do all this, but I gave up looking. I wrote my own. It provides a graphical user interface (GUI) to receive the user input. Be it photos from a camera or a short video clip. Then it copies the input files to temporary folders to process them and feed them to the ImageMagick with all the necessary scripting. I used Lazarus (Delphi clone) to keep the program absolutely free. I didn’t give the program a proper name or a version :P The exe is called animgif for it cannot be called unnamedfile-01.exe and the version number is the date and time I compiled it and uploaded the zip file to the server (animgif frontend zip date 2021-04-02T19:34:41+03:00). Tested it under Win32 XP and 7. You can download it from this link: http://csillagtura.ro/wp-content/uploads/animgiffrontend.zip . It is absolutely free, but a thank you email patting me on the shoulder would be nice :)