brighten differs from pre v1

[Steve-Mcl]

Has the parameter value definition changed from Jimp 0.x to 1.x?

Expected Behavior

Brightness with a value of 0 should not affect image like it did in v0.x
Brightness with a value of 1 should fully lighten an image like it did in v0.x
Brightness with a value of -1 should fully darken an image like it did in v0.x
Brightness with a value of -0.5 should half darken an image like it did in v0.x
Brightness with a value of 0.5 should half lighten an image like it did in v0.x

Using Jimp V0.x (using Node-RED to simplify testing)

Current Behavior

Brightness with a value of 0 in v1.6 behaves differently - it darkens the image
Brightness with a value of 1 in v1.6 behaves differently - it has little affect on the image
Brightness with a value of -1 correctly fully darkens an image like it did in v0.x
Brightness with a value of -0.5 in v1.6 behaves differently - it FULLY darkens the image
Brightness with a value of 0.5 in v1.6 behaves differently - it half darkens the image

Failure Information (for bugs)

Steps to Reproduce

Demonstrating -0.5 brightness

1. load image
   1. 
2. invert
   1. 
3. apply brightness -0.5
   1. 

Demonstrating -0.0 brightness

1. load image
   1. 
2. invert
   1. 
3. apply brightness -0.0
   1. 

Demonstrating 1.0 brightness

1. load image
   1. 
2. invert
   1. 
3. apply brightness 1.0
   1. 

Context

• Jimp Version: 1.6.0
• Operating System: Win 11
• Node version: 18

Failure Logs