Sean Barrett

ps: DOF = "degree(s) of freedom", e.g. normally we talk about cameras and rigid bodies as having 6 DOF, 3 position and 3 orientation, whether those are expressed as cartesian coordinates and euler angles, or spherical coordinates and a quaternion.

So maybe that prevents it from being solveable in that case, so the general purpose tool can't be used, but man, it's such a common case that it still seems worth putting in the special case tool. Plus you only need to mark the "true center" of the image once and then can do multiple corrections.

I guess there is an actual problem: if the image has been cropped off-center, you do have an extra DOF or 2--this is I guess what was underlying my original thought that one of the (x,y) vertices doesn't really count.

So apparently the answer is, if I want to adjust the perspective in images, I should write my own tool?!?

So it should be possible to recover rectangle width & height, although in an arbitrary coordinate space where z=1, but that's okay, all I want is to for Photoshop to preserve the *ratio* of width & height.

Maybe I'm missing something?

But Debevec was doing this stuff in 1996, 30 years ago.

You need a focal length/zoom for the camera. But you can freely scale the world (obj pos & width & height) without changing result, so that's one fewer DOF. Put obj z (depth) at 1 to reflect this.

So AFAICT 8 constraints and 8 DOFs: x,y,ra,rb,rc,width,height,fov

You have 4 2D points, or 8 constraints. (At first I thought maybe 2 of them don't count because you can arbitrarily reposition the image in 2D, but doing so actually affects the 3D position, so AFAICT all 8 count.)

Fixing camera at origin, you have 6 DOF for the plane, plus rect width & height.

Now, if you're perspective warping an arbitrary quadrilateral to an arbitrary quadrilateral, maybe not. But if you're transforming a rectangle-in-perspective, it should be viable. (And as long as either source or dest is meant to be flat 2D, you could construct an implicit rectangle.)

So, DOFs:

You can try to avoid this by using smart objects, but lo and behold, if you've Perspective Warped a smart object, you can no longer 2D transform it straightforwardly as it disables the smart effect (at least in PS 2022).

Second problem: Resizing by "eye" is imperfect! Pretty sure it's mathable.

So I got onto my computer with a newer Photoshop and tried Perspective Warp, where you draw out a quad in perspective and can correct it to rectangular... and it ALSO doesn't preserve this.

I see two problems: one, if as everyone says online you THEN resize it "by eye" you've lost image quality.

I've always been annoyed that Photoshop's old "Perspective" tool lets you warp along an axis but then it just kepes the other axis the same size, even though naively it should expand or shrink (e.g. you're tilting a square away from you, so the top & bottom become unequal AND it shrinks vertically).

The thing is, proper dolly-zoom is dramatic mostly because the way the background changes relative to the character. If you just did it on the character camera, the effect is more subtle--notably used recently by Severance.

still waiting for a source on "bragged about it"

Yes, but with no intention to cache them. The idea started with just thinking about the resurgence in lofi "boomer shooters" and such and how they could go all out and use sprite rendering, and then thinking that they could just rerender the sprites on the fly every frame.

"lofi" graphics idea:

render each character & object in right place at right size with wrong FOV/camera-distance for uncanny effect

render each character/object to separate offscreen buffer & blit back to introduce Z artifacts

snap character/object to camera-relative angles for fake sprite effect

We will need Nuremberg-like trials

He was wrongfully imprisoned for 43 years. Moments after being released, ICE took him Subramanyam “Subu” Vedam now faces deportation.

After spending 43 years in prison for a crime he didn't commit, evidence hidden by the prosecution reversed his conviction. Rather than finally enjoying freedom, ICE abducted him for deportation

Depraved.

www.miamiherald.com/news/local/i...

And like, of course it's fine! Professional musicians were using this thing in concerts and everything. We've just moved so far past it technologically and it seems so primitive that it's easy to forget it's plenty good enough.

"Star Trek TOS Season 3 episode name or The Smiths song name" quiz

Started testing out my rackmount 5-pin DIN MIDI synthesizers. I was a bit worried about latency because I remember horror stories from the '90s of MIDI Thru daisy-chaining getting pretty bad, which surely means ONE step must be significant latency.

Nope. With sparse events, ~1 ms for playing note.

possibly forgotten RPG lore:

Ultima Underworld (1992) let you write notes directly on the map

System Shock (1994, not an RPG but intended by developers to be in spirit of UW) let you click on the map to create a waypoint visible in the 1st person 3D view so you could use map for self-direction

I immediately thought of the infamous Battlecruiser 3000 ad from your original tweet.

(I pasted it here and then looked at it and decided, no, let's not.)

RIFs can’t be done without agency leadership so this is RFK Jr extending his purge of CDC scientists to help Vought’s shutdown agenda. Genuine public health risks created by aggrieved men.

I just checked youtube, and the video there is pretty low quality, are there better versions out there? (Copies on pirate bay are at 0 seeds.)

In late July, Paul Ingrassia, the White House liaison for the Department of Homeland Security, arrived at a Ritz-Carlton in Orlando with a lower-ranking female colleague and others from their department. When the group reached the front desk, the woman learned she didn’t have a hotel room. Ingrassia then informed her that she would be staying with him, according to five administration officials familiar with the episode. Eventually the woman discovered that Ingrassia had arranged ahead of time to have her hotel room canceled so she would have to stay with him, three of those officials said.

"30-year-old conservative lawyer and activist who is Trump’s nominee to lead the Office of Special Counsel, which deals with federal employee whistleblower complaints and discrimination" cancelled his colleague's hotel room so she would be forced to stay with him.
www.politico.com/news/2025/10...

A good way to win the Nobel Peace Prize is by making threats

every fucking time

FWIW, this was also how the main characters in LGS' Terra Nova (1996) were (software) rendered, but with each limb being one turn-to-face-the-camera sprite not a crossed-pair of two sprites.

SHAPIRO: OK, so you've spent your career creating television without Al, and I could imagine today you thinking, boy, I wish I had had that tool to solve those thorny problems... SIMON: What? SHAPIRO: ...Or saying... SIMON: You imagine that? SHAPIRO: ...Boy, if that had existed, it would have screwed me over. SIMON: I don't think Al can remotely challenge what writers do at a fundamentally creative level. SHAPIRO: But if you're trying to transition from scene five to scene six, and you're stuck with that transition, you could imagine plugging that portion of the script into an Al and say, give me 10 ideas for how to transition this. SIMON: I'd rather put a gun in my mouth.

David Simon, creator of ‘The Wire’, being interviewed by Ari Shapiro (NPR)

That's definitely the most-PTA of them to me.