ChatGPT does Presets

I asked ChatGPT to create film emulations for use in Lightroom, for Agfa CT-18 and Agfa CT-21 (my beloved slide films from yesteryear).

I was presented with comprehensive recipes, which work (at least, to my eyes).

Here is CT-18.

BASIC PANEL

• Exposure: 0.00 (adjust per image)
• Contrast: -10
• Highlights: -20
• Shadows: +10
• Whites: +5
• Blacks: -5

PRESENCE

• Texture: 0
• Clarity: -5
• Dehaze: -10
• Vibrance: +15
• Saturation: -5

TONE CURVE
Use custom point curve:

• Shadows: Lift slightly
• Midtones: Gentle S-curve
• Highlights: Lower slightly

HSL / COLOR
Tweak to emulate the warm, vintage color palette

• Red: Hue -5, Sat +5, Luminance +10
• Orange: Hue -5, Sat +10, Luminance +5
• Yellow: Hue -10, Sat -5, Luminance +15
• Green: Hue +15, Sat -20, Luminance +5
• Aqua: Hue +20, Sat -20, Luminance +10
• Blue: Hue +10, Sat -25, Luminance +15
• Purple & Magenta: Desaturate slightly (Sat -10)

SPLIT TONING / COLOR GRADING
Shadow tinting to emulate CT 18’s warmth

• Shadows: Hue 40, Sat 15 (warm shadow tint)
• Midtones: Hue 30, Sat 10 (gentle warmth)
• Highlights: Hue 50, Sat 10 (slight yellow glow)
• Balance: +10 (favor highlights)

DETAIL

• Sharpening: 25
• Radius: 1.0
• Detail: 25
• Masking: 30
• Noise Reduction: 10
• Color Noise Reduction: 20

LENS CORRECTION

• Remove Chromatic Aberration: ON
• Enable Profile Corrections: Optional

EFFECTS

• Grain: 25
• Size: 30
• Roughness: 50
• Post-Crop Vignette: -5

Using an iPhone DNG image, here is 1) the original, unprocessed 2) Agfa CT-21, nicely ‘warm’ and 3) Agfa CT-21, slightly cooler and more refined overall. Click on image to get full size.

I also asked DeepSeek to create presets. Here is the regulating CT-18 recipe. Simpler, but with some interesting similarities and differences.

• PROFILE: Adobe Color

• BASIC PANEL
  • Contrast: +15
  • Highlights: -20
  • Shadows: +10
  • Whites: +5
  • Blacks: -10
  • Clarity: +5

• TONE CURVE
  • Slight S-curve (boost shadows slightly, pull highlights down)

• HSL/COLOR
  • Reds: +Hue +5, +Saturation +10
  • Blues: -Hue -5, +Saturation +15

• COLOR GRADING
  • Shadows: Teal (H: 200, S: 10%)
  • Highlights: Warm Orange (H: 35, S: 15%)

• EFFECTS
  • Grain: Amount 25, Size 35, Roughness 50

• CALIBRATION
  • Red Primary: Hue +5, Sat +5
  • Blue Primary: Hue -5, Sat +10

Whilst ChatGPT can create the xml files to download and use straight away, DeepSeek cannot, so you have to create a text file then change its type.