Threshold and trim doesn't work after rotation

[jpbecotte]

What is the output of running npx envinfo --binaries --languages --system --utilities?
System:
OS: macOS 10.15.1
CPU: (4) x64 Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz
Memory: 153.41 MB / 8.00 GB
Shell: 5.7.1 - /bin/zsh
Binaries:
Node: 12.10.0 - /usr/local/bin/node
Yarn: 1.17.3 - /usr/local/bin/yarn
npm: 6.11.3 - /usr/local/bin/npm
Utilities:
Make: 3.81 - /usr/bin/make
GCC: 4.2.1 - /usr/bin/gcc
Git: 2.21.0 - /usr/bin/git
Clang: 1100.0.33.12 - /usr/bin/clang
Subversion: 1.10.4 - /usr/bin/svn
Languages:
Bash: 3.2.57 - /bin/bash
Elixir: 1.9.4 - /usr/local/bin/elixir
Java: 1.8.0_202 - /usr/bin/javac
Perl: 5.18.4 - /usr/bin/perl
PHP: 7.3.7 - /usr/local/bin/php
Python: 2.7.16 - /usr/bin/python
Python3: 3.7.6 - /usr/local/bin/python3
Ruby: 2.6.3 - /usr/bin/ruby

What are the steps to reproduce?
Use the following script:

const sharp = require('sharp');

const imageStr = 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async function process() {
  /* these steps are mandatory before finding the right angle */
  let image = await sharp(new Buffer(imageStr, 'base64'))
    .threshold()
    .trim(127);

  /* here I need to call a function that returns the right angle to deskew the image */
  const angle = -30;

  await image
    .rotate(angle)
    .threshold()
    .trim(127)
    .toFile('/tmp/image.jpg');
}

process()
  .then(() => console.log('ok'))
  .catch((err) => console.log(err))

What is the expected behaviour?
The functions threshold and trim should work as expected and all the black in top and bottom should be removed in the saved image.

Are you able to provide a standalone code sample, without other dependencies, that demonstrates this problem?
See above

Are you able to provide a sample image that helps explain the problem?
Look in the code!

[lovell]

Hi, thanks for reporting, commit e9b21f2 adds a test and the fix. This will be in v0.25.0.

[lovell]

This is now available.