App Shopper: Spectra - Video & Audio to Art (Photography)
App Shopper: Spectra – Video & Audio to Art (Photography)
Spectra is an app to create computational art from video and audio on iOS and Mac.
Settings files store the parameters that describe the art form and include:
• Control values
• Color palettes
• Audio samples
With built-in presets, video and audio samples you can generate cool art immediately! Then customize with your own settings, video and color palettes.
Many extra presets are available from within the app using 'Show More Settings' in the File menu.
You can save settings in the 'MySettings' table of the presets pane, or in iCloud with ‘Save Settings in iCloud’ in the File menu. This enables sharing between iOS and Mac.
Saved settings and presets will include the current color palette – which you may have created yourself from the 'Colors' pane – and the current audio.
Video frames can be used for creating color palettes for drawing, and the audio is used to modulate line or arc length – the components of the paths Spectra draws.
A color palette generator is in the colors pane, where you also can quickly switch between video, settings file, variable, random or grayscale palettes. The variable palette generates color using a given color and a periodic trigonometric function. Generating colors in this way is fun with unlimited surprising results.
Visit the website for many examples, a demo and screenshots visually elucidating the simple process to transform video to art.
Using color and sound from videos various art forms are generated automatically with with attributes dependent on the values of user selected parameter controls.
Use your device videos, screen recordings or your favorite theatrical movies as input. You can use the audio of the video, or load a separate audio file.
The output can be printed from high resolution PNG images, or you can output the art as resolution independent PDF files to print at any resolution supported by a particular printer.
Spectra can be used as a platform for educators to integrate mathematical computation with creative art.
Although Spectra does not teach these concepts it can be used as a fun visualization and experimentation of applied math.
Numerous mathematical concepts can be introduced and illustrated through the art forms Spectra mathematically generates:
• transformations, functions, plots and parameters
• plane geometry: lines, triangles, circles, chords
• angles, rotation, trigonometry, radians
• distance, arc length, area
• randomness
4 basic art forms whose names are derived from the math:
• linear
• radial
• arc
• chord
Each Spectra graphic is merely a path composed of lines, circle arcs and chords. Each part corresponds to a particular frame of the video and sound level at the same time.
When using video as a color source every color is chosen as the average color of the frame.
Various other parameters you can adjust include:
• inner and outer radius
• zoom and 2 different arc length modes
• use of audio for line width and length modulation
• random, grayscale and parametrized color palettes
• random variability in frame selection ranges
• descriptive title label
• art aspect ratio
• line capping and width
• alpha gradient : the transparency of each part can diminish gradually over time so it is apparent what other parts it may overlap
• path filling to create solid pie shapes
To get a better glimpse of the variety of art you can generate peruse our website ‘Gallery’.
For your convenience…
• Presets Table: Select from many control, color and sound settings sets. Then customize by changing the control, color and sound, say from another settings file.
• You can save your settings, including the colors and audio samples for reuse on both platforms.
• Two sample videos.
• Audio Samples: Additional audio files are built into the app, in particular many presets contain sample audio. This enables you to use the app “out of the box.”
Enjoy!
On Mac App Store:
https://itunes.apple.com/us/app/spectra-transform-video-to-art/id1105517454?ls=1&mt=12
Show More…
What’s New
FIXED: Saving background images to the Photos library now preserves transparency. In this way restoring a background from the photos library will restore the transparency, which is important for the mask mode of the Color pane.
Previous updates:
Improved Performance: Settings data is cached to handle the increased load from incorporating background images and waveform audio files. Most notably the presets table scrolls more smoothly, but other methods that use settings data is faster.
Background Preview in Settings: The background image can be previewed from the user settings table. (Swipe on a row in iOS, right(control)-click on a row in macOS.)
Open Settings Options: Opening settings is more discriminate – if current settings has background, but new settings do not then an alert is presented because the existence of a background could mean the spectra does not look as expected unless you change the background settings.
Play Waveform Audio: The current waveform audio file can be played (if it exists; a waveform graphic only displays the audio samples, and its presence does not mean there is an audio file associated with it.) Select 'Play Waveform Audio' from the Audio menu. (Or on Mac use the 'Play Waveform Audio' button, and in iOS tap the waveform graphic)
Apply Audio File Option: When opening settings with an audio file contained you have the option to 'apply' the audio file. This means that the file is read and stored as the current audio file for the waveform. This way if the settings are changed and saved a copy of the same audio can be included. (Audio is saved so that you can recall the audio by playing it from the user setting table.)
Save Audio Option: Saving settings presents the option to NOT save the current waveform audio file. Saving the audio file is for two purposes:
1. So that you can recall the audio by playing it from the user setting table.
2. So that if you load setting with an audio file you apply it so it may be included when saving a modified version of the settings.
New User Settings Table Row Labels: Labels in the user settings table indicate : contains audio data file, creation date and data size of the file.
New Labels & Colors For Clarity: New terminology adopted: 'Mask the spectra by the background image or vice versa. Implements ‘white on alpha’ masking, where white is transparent.’ This is to emphasize the intended usage of the 'White' color in the color pane, and the use of the 'Invert' operation for masks.
Mask Inversion: Masks can be inverted. This is intended for use with 'white on alpha masks' – namely masks created as white with transparency. Choose the 'White' color option for a spectra and then save it as a background for masking. When inverted white pixels becomes transparent and transparent pixels become white.
Background Color for Contrast: Since newer versions of Spectra enable coloring spectra with white it was hard to distinguish them when the default view background is white, therefore the default is now slightly 'off white' to provide contrast.
– The current audio data, as well as the processed samples for graphics modulation, is stored in a Spectra settings file enabling playing of the audio within Spectra.
To play the audio: In the ‘My Settings’ pane of Presets swipe across a row to display the row actions menu: Play, Rename, Delete and select ‘Play’.
If there is no audio to play you are told so – for example old settings files will not contain audio.
Note: When loading settings the audio data is not used to replace the current audio being used by Spectra. But since you can now play the audio that was the current audio at the time the settings were saved you can recall what it was.
– Ads have been removed to increase the space available to display controls panes.
– Also : new isosceles triangle option, save Spectra to video, mask images by spectra, use images for color, composing spectra via backgrounds
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