JoshuaSullivan

Core Image Filters

iOS 12.2 has 207 filters.

Accordion Fold Transition (CIAccordionFoldTransition)

First available: iOS 8

Transitions from one image to another of a differing dimensions by unfolding.

JoshuaSullivan

Core Image Filters

iOS 13 has 218 filters.

New Filters in iOS 13

• CIDocumentEnhancer
• CIGaborGradients
• CIKeystoneCorrectionCombined
• CIKeystoneCorrectionHorizontal
• CIKeystoneCorrectionVertical

JoshuaSullivan

Midjourney Quick-Start Guide

Midjourney is a commercial image generation and transformation AI service. Similar services include:

• DALL-E 2 (Microsoft)
• Nightcafe
• Stable Diffusion (Open Source)

Midjourney is a somewhat opinionated AI and tends to try to create "art". It has a very high level of coherence, which means elements in the resulting images tend to have natural relationships with a low level of glitches and random weirdness. In my opinion, Midjourney has much higher quality "out of the box", trouncing the competition unless the user is quite advanced at effectively utilizing both positive and negative prompt particles.

JoshuaSullivan

// Improved Noise - Copyright 2002 Ken Perlin.
// Adapted and updated for iOS by Joshua Sullivan, 2016.01.12

// Apply the function 6t^5 - 15t^4 + 10t^3
float fade(float t)
{
    return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);
}

// I'm keeping this around for reference.

JoshuaSullivan

import UIKit
import Combine

/// This class wraps a `CADisplayLink` and exposes its callback as a Combine Publisher.
///
class CombineDisplayLink {

    /// An object that includes timing information about the screen refresh.
    ///
    struct Tick {

JoshuaSullivan

//
//  ColorCubeHelper.swift
//
//  Created by Joshua Sullivan on 10/01/16.
//  Copyright © 2016 Joshua Sullivan. All rights reserved.
//

import UIKit
import Accelerate

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//
//  ColorCubeImageCreator.swift
//  ColorCubeImageCreator
//
//  Created by Joshua Sullivan on 4/25/16.
//  Copyright © 2016 Joshua Sullivan. All rights reserved.
//

import UIKit

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// This works.
kernel vec4 simpleFilter(sampler p)
{
  vec2 dc = destCoord();
  return sample(p, samplerTransform(p, dc));
}

// This does not. It produces [0, 0, 0, 255] for the first 255 pixels and then [0, 0, 0, 0] thereafter.
kernel vec4 simpleFilter(sampler p)
{

JoshuaSullivan

import Foundation
import CoreImage

struct FilterInput {

    struct ValueRange {
        let minValue: Float
        let maxValue: Float
        let sliderMin: Float?
        let sliderMax: Float?

JoshuaSullivan

//
//  CapturedImageSampler.swift
//  ARKitTest
//
//  Created by Joshua Sullivan on 9/22/17.
//  Copyright © 2017 Joshua Sullivan. All rights reserved.
//

import UIKit
import ARKit