docs: fix format count, missing formats, TIFF description, and orphaned sentence

Agent-Logs-Url: https://github.com/cross-org/image/sessions/82db3afd-245a-4890-b8d3-71dca53c36f4

Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com>

Author: Copilot

README.md

@@ -199,8 +199,8 @@ const imageWithWarnings = await Image.decode(data, {
 ```
 
 **Note:** When using `Image.decode()`, the library automatically tries runtime-optimized decoders
-
-## CMYK Color Space Support
+(ImageDecoder API) first, falling back to the pure JS decoder with tolerant mode for maximum
+compatibility.
 
 The library provides utilities for working with CMYK (Cyan, Magenta, Yellow, Key/Black) color space,
 commonly used in professional printing and color manipulation.
@@ -378,9 +378,6 @@ const roundtrip = await Image.decode(parsed.bytes, "png");
 console.log(roundtrip.width, roundtrip.height);
 ```
 
-(ImageDecoder API) first, falling back to the pure JS decoder with tolerant mode for maximum
-compatibility.
-
 ## Fault-Tolerant Decoding for Other Formats
 
 In addition to JPEG, @cross/image provides fault-tolerant decoding for several other formats that

docs/src/examples/decoding-encoding.md

@@ -280,6 +280,51 @@ const pcx = await image.encode("pcx");
 await Deno.writeFile("output.pcx", pcx);
 ```
 
+### QOI (Quite OK Image)
+
+Fast lossless format with simple encoding.
+
+```ts
+import { Image } from "jsr:@cross/image";
+
+const data = await Deno.readFile("input.png");
+const image = await Image.decode(data);
+
+// Encode as QOI
+const qoi = await image.encode("qoi");
+await Deno.writeFile("output.qoi", qoi);
+```
+
+### PGM (Portable GrayMap)
+
+Netpbm grayscale format; RGB is converted to grayscale using luma weighting.
+
+```ts
+import { Image } from "jsr:@cross/image";
+
+const data = await Deno.readFile("input.png");
+const image = await Image.decode(data);
+
+// Encode as PGM (binary P5 format)
+const pgm = await image.encode("pgm");
+await Deno.writeFile("output.pgm", pgm);
+```
+
+### PBM (Portable BitMap)
+
+Netpbm monochrome format; pixels at or above luma 128 become white.
+
+```ts
+import { Image } from "jsr:@cross/image";
+
+const data = await Deno.readFile("input.png");
+const image = await Image.decode(data);
+
+// Encode as PBM (binary P4 format)
+const pbm = await image.encode("pbm");
+await Deno.writeFile("output.pbm", pbm);
+```
+
 ## Format Conversion Examples
 
 ### PNG to JPEG

docs/src/index.md

@@ -136,12 +136,13 @@ await Image.decode(bytes, "png");
 
 ## Supported Formats
 
-@cross/image supports 15 image formats with varying levels of pure-JS implementation:
+@cross/image supports 18 image formats with varying levels of pure-JS implementation:
 
-- **PNG, APNG, BMP, ICO, GIF, DNG, PAM, PPM, PCX, ASCII** - Full pure-JS implementation
+- **PNG, APNG, BMP, ICO, GIF, DNG, PAM, PPM, PGM, PBM, PCX, QOI, ASCII** - Full pure-JS
+  implementation
 - **JPEG** - Pure-JS baseline & progressive DCT
 - **WebP** - Pure-JS lossless, native API for lossy VP8
-- **TIFF** - Pure-JS uncompressed + LZW, native API for other compressions
+- **TIFF** - Pure-JS uncompressed, LZW, PackBits & Deflate; native API for JPEG compression
 - **HEIC, AVIF** - Runtime-based implementation (requires ImageDecoder/OffscreenCanvas API)
 
 See the [Format Support](formats.md) page for detailed compatibility information.