exif

Similar to jpeg / jpg we would appreciate adding alternate tif delegating to tiff format in formats map which is used in toFormat method.

https://github.com/lovell/sharp/blob/7467fa8b50d280780dfa9fe9a7248deaa499c7a1/lib/output.js#L14

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensur

Prerequisites

• I have written a descriptive issue title
• I have verified that I am using the latest version of Magick.NET
• I have searched open and closed issues to ensure it has not already been reported

Description

I'm seeing a weird results (

Add environment variables to make it possible to disable the following features:

• Face Recognition: PHOTOVIEW_DISABLE_FACE_RECOGNITION=1
  completely disable face recognition and hide the icon from the side menu

• Video encoding: PHOTOVIEW_DISABLE_VIDEO_ENCODING=1
  disable ffmpeg encoding, but still allow web compatiable videos that doesn't need encoding.

• **RAW processing:

Hi,

I have a huge collection of photos, and think it would be nice to get back to the last position in image list when reopening the app, some kind of session restore in a way.
Thanks a lot for your work

Raphael