wonderland

STEP ONE: create the base gifs! I'd recommend staying between 25-40 frames for each gif, since the transitions we'll use later tend to increase gif sizes. these are the ones I'll be using for this tutorial:

STEP TWO: create the guide layouts for both base gifs. for this panel, I chose a 4x4 grid — I would recommend keeping the number of "tiles" low because it can get tedious, but have a minimum of 9 (3x3 grid).

now your canvas should look like this:

STEP THREE: create the tiles. this is where the going gets rough; there might be easier ways to do this that I couldn't think of 😭 if there are any please send me an ask!

essentially, in this step we'll cut up the base gifs into smaller squares so that each tile can be manipulated separately when we put both gifs together. to do this, first create a square using the rectangle tool and the guides. then duplicate the base gif, move it above the square, apply a clipping mask, and then convert the clipped gif and square (selected in the image below) into one smart object.

ALTERNATELY: you could duplicate the original base gif and use layer masks to isolate tiles. create a layer mask for the duplicated gif layer and, with the layer mask selected, drag your mouse over a square (using the guide layout) and press delete. then press ctrl/cmd + i to invert the layer mask so that the gif only shows in the square of your choosing.

now repeat until you've got the entire gif in tiles, and do the same for the other gif!

since the transition effect is achieved by staggering the crossfades for each tile of the final gif, you can cheat by having multiple tiles "flip" at a time, ideally no more than four. this means you need to cut the base gif up into fewer pieces. to do this, simply draw multiple squares instead of one and then merge the shapes, before duplicating and clipping the gif onto them.

if you do this, it's essential to remember that you have to divide both gifs up in the exact same way. each piece of the b/w gif has to correspond to a piece of the purple gif!

this is what the layers look like for each gif once I'm done:

I have them lettered so that it'll be easier to match them up in the next step.

STEP FOUR: this is the complicated bit that took me two days to figure out. I'll do my best to explain but don't hesitate to reach out if something isn't clear!

to begin, open up a new psd and import both base gifs into it. (remember to click "create video timeline" and ensure that your gifs are all in order before proceeding.)

now, the trickiest part about this transition is ensuring that all the little tiles sync up so that the larger gif is coherent. so first we'll create some markers (just empty layers) to ensure that everything lines up as it should. — marker 1: at about halfway through the first gif (b/w in this case) — marker 2: at about a quarter of the gif length — marker 3: close to the end of the gifs

at this point we're ready to start bringing in the tiles. I'm going to delete the base gifs from this new psd just to keep things cleaner!

first thing to do is import my b/w tile. move the timeline slider over to marker 1 and split the first gif. (if it helps, rename the split gifs and add (start) and (end) to the two halves.) then, move the (end) half to the beginning of the timeline, and the (start) half to line up with marker 3.

the purple tile is easier to manage. simply import it into the psd and line it up with marker 2.

your timeline should now look like this:

notice the overlap between the gifs at their beginnings and ends — this is where you'll be able to cascade the tiles flipping, so it helps to have a significant amount of overlap.

crop the three gifs for this tile as you see fit! since this is the first tile I want to flip from b/w to purple, I'll crop gif 1a (end) all the way to the current position of the timeline slider (red line with blue tip) and leave the beginning of gif 2a uncropped. for the flip from purple to b/w, I'll crop both gifs a bit.

once that's done, drag all three gifs onto the same level in timeline so they form a video group. your timeline should look something like this:

now you just repeat the process for all the other tiles! as long as you made sure that all the tiles in one gif correspond with tiles in the other gif in step three, this should be a fairly painless process. make sure to crop the starts/ends of the gifs separately so that they don't all flip together.

this is what my layers look once I've done all the tiles:

and the gif!

STEP FIVE: transitions! click on the half-white square (top right of the left column in the timeline, beside the scissors) and select the crossfade transition, then drag it between two gifs in a video group. it should create a two-triangle symbol and shorten the overall length of the video group.

apply the transition to all the tile flips, ensuring that the duration of all transitions is constant. this can sometimes be tricky because ps likes to change the duration of each transition, so right click on the transition symbol and manually change all your transition durations to be the same.

your layers should now look something like this:

STEP SIX: draw the grid. bring back the guide layout from step two and using the line tool (I like 2px thickness), trace the grid. adjust opacity as you see fit (50-80% is usually a good idea), so that the canvas looks like this:

STEP SEVEN: export and celebrate! you're done!