Spectral transition guide
Every control
Every control in the panel, top to bottom. The picture itself is a control too: tap it anywhere to start a run.
Load and save
Under the tiles a line says what plays: the samples until you add your own, then A plays into B. Kept on this device, never uploaded. Your pictures follow you to every lab tool that takes a picture, until you press × on a tile.
- Image AButton
- Picture A as a tile: press it to add or replace your own; two pictures picked or dropped at once fill A and B. The × on a picture takes it away and the sample plays again. Your pictures stay on this device and follow you to every lab tool that takes a picture.
- SwapButton
- Exchanges A and B, so the transition plays the other way. With one picture of your own, it moves to the other side and the sample takes its place.
- Image BButton
- Picture B, the one A plays into, as a tile: press it to add or replace your own. The × takes it away and the sample returns. See PNG and JPEG.
- Save PNGButton
- Saves the frame as it is at that moment, as aikizi-spectral-transition.png. See PNG.
- Record videoButton
- Records one run: it presses Replay itself and records the canvas for up to seven seconds. While recording it reads Stop recording; press it to stop early. See record video.
- ReplayButton
- Plays a run again at once, in the direction the next run would go. See replay.
Effect
- EffectChoice
- Opens another of the 14 image transitions. Each one is its own page, so your pictures and settings stay behind.
Presets
- Apparition · Structure first · Texture swap · X-ray cross · Spectral dissolvePick one
- Sets every control at once; it does not start a run. The highlight goes as soon as you change a control.
- Apparition: The opening look: structure first, band stagger 0.78, X-ray ghost 0.72, 6 bands, 2.6 seconds, strong ease in-out. B's shapes form well before its detail. See apparition.
- Structure first: A clean change from broad to fine with little ghost: structure first, stagger 0.55, ghost 0.32, 6 bands, 2 seconds, ease in-out. See structure first.
- Texture swap: Fine detail changes first while A's shapes hold: detail first, stagger 0.62, ghost 0.38, 5 bands, 1.8 seconds, ease out. See texture swap.
- X-ray cross: The layers as far apart as they go, with the strongest ghost: structure first, stagger 1, ghost 1, 7 bands, 2.8 seconds, ease in-out. See X-ray ghost.
- Spectral dissolve: All layers change almost together, with a faint ghost: structure first, stagger 0.18, ghost 0.22, 6 bands, 1.6 seconds, expo out. See spectral dissolve.
Sliders
These controls change the next run, and the frame on screen at once when no run is playing.
- MethodChoice
- How each picture is split into layers. Pyramid, the opening choice, uses blurred copies at halving sizes, a Laplacian pyramid. Fourier splits the brightness into waves with a Fourier transform and changes rings of them, slow waves to fast ones, while the colour crossfades; X-ray ghost and Bands do nothing with it. A preset or Reset sets the pyramid again. See Laplacian pyramid.
- Band orderChoice
- Which layers change first. Structure first sends the broad shapes across first; detail first sends the fine texture first. See structure first and detail first.
- Transition speedSlider · 0.3 to 4 · starts at 1.7
- How fast a run plays; right is faster. A run lasts 4 seconds at the left end and 0.3 seconds at the right. The number beside it compares with the opening look, Apparition at 2.6 seconds, so it reads 1.00× at the start; 2.00× is twice as fast.
- Band staggerSlider · 0 to 1 · starts at 0.78
- How far apart the layers take their turns. At 0 they all change together, close to a plain crossfade; at 1 the first layer has finished before the last one starts. See band stagger and stagger.
- X-ray ghostSlider · 0 to 1 · starts at 0.72
- How much a layer's contrast is raised while its A and B halves still disagree, so edges of both pictures glow through each other mid-change. At 0 there is no lift. Pyramid method only. See X-ray ghost and contrast.
- BandsSlider · 4 to 7 · starts at 6
- How many layers of detail each picture is split into, from 4 to 7, plus one last layer with the broadest shading. More layers give more separate turns. Pyramid method only. See band count and image bands.
- EasingChoice
- How a run speeds up and slows down: Linear, three strengths each of ease in and ease out, two of ease in-out, expo out and back out. See easing, ease-in, ease-out, easing strength and expo out.
Export
Under the buttons, a line tells you what the last export did, such as PNG saved.
Reset
Back to the Apparition preset. Your pictures stay.
- ResetButton
- Sets every control back to the Apparition preset. Your pictures and the direction of the next run stay as they are.