jdmichaud

MRC — Mixed Raster Content

A summary of what MRC is, how it's structured inside a PDF, why it produces small files for scanned books, and how to create MRC PDFs yourself.

1. What MRC is

MRC is a technique for encoding a scanned page as multiple raster layers instead of one flat image. Each layer is specialised for one kind of content (paper colour, ink colour, ink shapes) and encoded with the codec that

Basic Options

Get the name of the printer

lpstat -p

Get the options:

lpoptions -p DCP1510 -l

Variant	Year	Clock (MHz)	Bus (MHz)	Mult.	FPU	L1 Cache	Pipeline	MMU	Reg Width	Addr Bus	Data Bus	Process	Transistors	Voltage	Notes
80286	1982	6, 8, 10, 12.5	= clock	1x	None (ext. 80287)	None	~3-stage prefetch	Segmentation only	16-bit	24-bit	16-bit	1.5 µm	134K	5V
386DX	1985	16, 20, 25, 33	= clock	1x	None (ext. 80387)	None	Prefetch, not pipelined	Seg + paging	32-bit	32-bit	32-bit	1.5→1 µm	275K	5V	Full 32-bit debut
386SX	1988	16, 20, 25, 33	= clock	1x	None (ext. 80387SX)	None	Same as 386DX	Seg + paging	32-bit	24-bit	16-bit	1→0.8 µm	275K	5V	Cost-reduce

GPU API Overview Table (sorted by year, newest first)

API	Type	Platform	Vendor	Level	Primary Use	Year
WebGPU	Graphics + Compute	Web browsers	Khronos Group	Low-level	Next-gen web GPU	2023
MoltenVK	Translation	Apple platforms	Khronos Group	N/A	Vulkan on Metal	2018
Direct3D 12	Graphics	Windows, Xbox	Microsoft	Low-level	Modern game engines	2015
Vulkan	Graphics + Compute	Cross-platform	Khronos Group	Low-level	Modern cross-platform rendering	2016
Metal	Graphics + Compute	macOS, iOS	Apple	Low-level	Apple ecosystem apps/games	2014
Mantle	Graphics	Windows (deprecated)	AMD	Low-level	Vulkan precursor	2013

Lemmings

Star Raiders II

THE GRAND MASTER

Genre: Historical Drama
Tone: Quietly tragic, observational, with subtle humour and moments of intensity
Languages: English and French (as appropriate)
Point of View: George Walker

CONTEXT

Set in 1834, The Grand Master tells the story of Alexander McDonnell and Louis-Charles Mahé de La Bourdonnais, two of the greatest chess players of their time. Despite living in opposite worlds and speaking different languages, they share a deep, unspoken connection through the chessboard, where their personalities are reversed:

Business opening hour

related HN entry: https://news.ycombinator.com/item?id=47170157
All the places (business data scraper): https://alltheplaces.xyz/
Comment about reconciling data: https://news.ycombinator.com/item?id=47175533

List devices:

scanimage --list-devices

Get device capability:

scanimage --help --device-name=brother4

Do not use /dev path here but the first part of the device string provided by the list devices command:

	use rusqlite::{Connection, Result, Params};

	pub struct Query<'conn> {
	stmt: rusqlite::CachedStatement<'conn>,
	}

	impl<'conn> Query<'conn> {
	pub fn new(conn: &'conn Connection, sql: &str) -> Result<Self> {
	Ok(Self { stmt: conn.prepare_cached(sql)? })
	}

	(window as any).console.image = (canvas: HTMLCanvasElement, targetWidth?: number, targetHeight?: number) => {
	const url = canvas.toDataURL();
	const image = new Image();
	image.src = url;

	image.onload = () => {
	// 1. Determine dimensions: Use target resolution if provided,
	// otherwise default to the canvas's own dimensions.
	const w = targetWidth ?? canvas.width;
	const h = targetHeight ?? canvas.height;