Skip to content

Instantly share code, notes, and snippets.

View vforsh's full-sized avatar
💭
yo

Vladislav Forsh vforsh

💭
yo
22 followers · 40 following
View GitHub Profile
@vforsh
vforsh / Permutation.d.ts
Created July 31, 2022 20:45 — forked from betafcc/Permutation.d.ts
Typescript Union Permutation, count of keys in an object, count of cases in an Union
/**
* @example
* type P = Permutation<1 | 2 | 3>
* // [1, 2, 3] | [1, 3, 2] | [2, 1, 3] | [2, 3, 1] | [3, 1, 2] | [3, 2, 1]
*/
export type Permutation<U, T = U> = [U] extends [never]
? []
: T extends unknown
? [T, ...Permutation<Exclude<U, T>>]
: never
@vforsh
vforsh / simulate_scanned_PDF.md
Created February 7, 2018 07:49
Simulate a scanned PDF with ImageMagick

Simulate a scanned PDF with ImageMagick

  1. Download and install Ghostscript and ImageMagick + Convert Module
  2. Execute the following command in the console (change the filename)
$ convert -density 200 INPUT.pdf -rotate 0.3 +noise Multiplicative -format pdf  -quality 85 -compress JPEG -colorspace gray OUTPUT.pdf

Description of the options

  • -density: set the input DPI to 200
  • -rotate: set Page rotation to 0.3 degrees