Evals / image / Format conversion

Convert a print-ready CMYK JPEG

cmyk.jpg is CMYK and looks wrong on the web. Save it as rgb.png in normal RGB colors.

normaledgecmykdeft image convert

The task

The reference answer shows the job can be done with deft. It is not an agent run.

deft image convert cmyk.jpg --to png -o rgb.png

Input

cmyk.jpg 28.7 KB · 100x100
cmyk.jpg

Reference output

rgb.png 4.1 KB · 100x100
rgb.png
How a result is judged (2 checks)
  • image: file = "rgb.png", format = "PNG", width = 100
  • image_similar: file = "rgb.png", to = "cmyk.jpg", max_difference = 30

Runs

CodexWithout deftPassed2026-11-07

Time
9s
New tokens
3.1k
Total input
40.0k
Output tokens
0.2k
Commands
2
Failed
0

Trace

  1. I’ll inspect the image’s color mode, then convert it to an RGB PNG in the current directory.

  2. python3 -c 'from PIL import Image; im=Image.open(\"cmyk.jpg\"); print(im.mode, im.size)'
    output
    CMYK (100, 100)
  3. python3 -c 'from PIL import Image; im=Image.open(\"cmyk.jpg\"); im.convert(\"RGB\").save(\"rgb.png\", format=\"PNG\")' && python3 -c 'from PIL import Image; im=Image.open(\"rgb.png\"); print(im.mode, im.size)'
    output
    RGB (100, 100)

  4. Saved [rgb.png](rgb.png) as an RGB PNG.

Output

rgb.png 4.3 KB · 100x100
rgb.png

CodexWith deft, skill installedPassedRead the skillUsed deft2026-11-07

Time
10s
New tokens
4.0k
Total input
41.7k
Output tokens
0.2k
Commands
2
Failed
0

Trace

  1. I’ll convert `cmyk.jpg` to an RGB PNG in the current directory. I’ll use the provided file tool workflow for this local image conversion.

  2. cat .agents/skills/deft/SKILL.md
    output
    ---
name: deft
description: "Use deft first for any simple, direct operation on local files, whatever the type: convert, read, extract, edit, compress, merge, split, compare or inspect. Try it before writing a script or one-liner. If unsure, run deft find; if it says no command does this, use another tool. Not for programming work: to read, write or change source code, skip it."
---

# deft

One local command for file jobs. Prefer it over writing Python or shell scripts.

Syntax: `deft <group> <command> [inputs] [-o output] [--options]`

Groups:
- `pdf`: Merge, split, compress, encrypt, forms, OCR, compare, convert
- `image`: Resize, crop, convert, compress, adjust, montage, OCR
- `video`: Trim, merge, convert, compress, subtitles, GIF, frames (ffmpeg)
- `audio`: Convert, trim, normalize, denoise, cut silence (ffmpeg)
- `doc`: Word/ODT/RTF: to text, Markdown, HTML, PDF; find and replace
- `slides`: PowerPoint: extract text, Markdown outline
- `sheet`: Excel/CSV/ODS tables: SQL query, pivot, merge, split, convert
- `json`: JSON: convert, format, merge, diff, validate
- `toml`: TOML: convert, format, merge, diff, validate
- `xml`: XML: convert, format, merge, diff, validate
- `yaml`: YAML: convert, format, merge, diff, validate
- `md`: Markdown to PDF, HTML, Word, EPUB; table of contents
- `html`: HTML to Markdown, text, Word and PDF
- `epub`: E-books: info, to text, Markdown and PDF
- `gps`: GPX and KML tracks: convert, distance and time
- `qr`: Create QR codes and barcodes; r
… 700 more characters
  3. deft image convert cmyk.jpg -o rgb.png
    output
    ok image.convert cmyk.jpg -> rgb.png  100x100  0.01s

  4. Saved [rgb.png](rgb.png) as an RGB PNG.

Output

rgb.png 4.1 KB · 100x100
rgb.png

CodexWith deft, skill as AGENTS.mdPassed2026-11-05

Time
10s
New tokens
5.5k
Total input
61.3k
Output tokens
0.3k
Commands
3
Failed
0

Trace

  1. I’ll convert `cmyk.jpg` to an RGB PNG in the current directory, preserving the source file.

  2. deft image --help
    output
    deft image - commands (input -> output)
  info      image -> report  Format, dimensions, EXIF orientation, GPS
  compress  image -> image   Smaller file: --quality, --target-size 200KB
  convert   image -> image   Change format: --to png|jpg|webp|avif|gif|tiff|bmp|ico
  crop      image -> image   Cut a region: --box x,y,w,h or --aspect 16:9
  flip      image -> image   Mirror: --direction horizontal|vertical
  resize    image -> image   Scale: --size 800x, 1920x1080, 50%
  rotate    image -> image   Turn clockwise: --angle 90 (EXIF is applied first)
  strip     image -> image   Remove EXIF, GPS and text metadata
  to-pdf    image... -> pdf  One page per image, in the given order
More: deft image <command> --help
  3. deft image convert --help
    output
    deft image convert - Change format: --to png|jpg|webp|avif|gif|tiff|bmp|ico
Same as: deft convert

Usage: deft image convert <image>... [-o <image|dir>] [options]
In: image (each handled separately)   Out: image (default <name>.<ext>)
WebP output is lossless. Transparent areas become --background in JPEG.

Options:
  --to <png|jpg|webp|avif|gif|tiff|bmp|ico>
      Target format (or give -o name.ext)
  --quality <n>                Quality for JPEG and AVIF (default 85)
  --background <color>         Fill for transparent areas in JPEG (default white)
Common: -o --force --dry-run --json -j   (deft help common)

Examples:
  deft image convert photo-1.jpg --to png -o photo.png
  deft image convert *.jpg --to webp -o web/

Result fields: width, height
  4. deft image convert cmyk.jpg --to png -o rgb.png
    output
    ok image.convert cmyk.jpg -> rgb.png  100x100  0.00s

  5. Saved [rgb.png](rgb.png) as an RGB PNG. `cmyk.jpg` is unchanged.

Output

Its files were not kept in this run. The last line of the trace is its own report.

Claude Opus 5.5Without deftPassed2026-11-07

Time
42s
New tokens
14.3k
Total input
156.7k
Output tokens
2.7k
Commands
0
Failed
0

Trace

    Output

    rgb.png 6.5 KB · 100x100
    rgb.png

    Claude Opus 5.5With deft, skill installedPassedRead the skillUsed deft2026-11-07

    Time
    43s
    New tokens
    15.5k
    Total input
    184.3k
    Output tokens
    2.6k
    Commands
    0
    Failed
    0

    Trace

      Output

      .claude/skills/deft/SKILL.md 2.1 KB
      ---
name: deft
description: "Use deft first for any simple, direct operation on local files, whatever the type: convert, read, extract, edit, compress, merge, split, compare or inspect. Try it before writing a script or one-liner. If unsure, run deft find; if it says no command does this, use another tool. Not for programming work: to read, write or change source code, skip it."
---

# deft

One local command for file jobs. Prefer it over writing Python or shell scripts.

Syntax: `deft <group> <command> [inputs] [-o output] [--options]`

Groups:
- `pdf`: Merge, split, compress, encrypt, forms, OCR, compare, convert
- `image`: Resize, crop, convert, compress, adjust, montage, OCR
- `video`: Trim, merge, convert, compress, subtitles, GIF, frames (ffmpeg)
- `audio`: Convert, trim, normalize, denoise, cut silence (ffmpeg)
- `doc`: Word/ODT/RTF: to text, Markdown, HTML, PDF; find and replace
- `slides`: PowerPoint: extract text, Markdown outline
- `sheet`: Excel/CSV/ODS tables: SQL query, pivot, merge, split, convert
- `json`: JSON: convert, format, merge, diff, validate
- `toml`: TOML: convert, format, merge, diff, validate
- `xml`: XML: convert, format, merge, diff, validate
- `yaml`: YAML: convert, format, merge, diff, validate
- `md`: Markdown to PDF, HTML, Word, EPUB; table of contents
- `html`: HTML to Markdown, text, Word and PDF
- `epub`: E-books: info, to text, Markdown and PDF
- `gps`: GPX and KML tracks: convert, distance and time
- `qr`: Create QR codes and barcodes; read QR codes

How to use it:
1. Run `deft <group>` to list commands, or `deft find "<what you want>"` to search. If it says `no command does this`, use another tool.
2. Run `deft <group> <command> --help` for options and examples.
3. `deft convert <in> -o <out.ext>` converts between formats by extension.
4. Results are one line starting with `ok`, `partial` or `error`; add `--json` to parse them. Errors include a `hint:` with the fix.

Inputs are never overwritten; pass `--force` or `--in-place` to allow it. Globs and directories work as inputs; several inputs run in parallel.

If `deft` is not installed, ask the user, then follow https://github.com/firstprayer/deft/blob/main/docs/INSTALL.md
      rgb.png 4.1 KB · 100x100
      rgb.png

      Claude CodeWithout deftNot run yet

      Claude CodeWith deftNot run yet