Set brightness of an image

Questions
1

Hello guys, so recently I have to do a project to school, but I’m kinda stuck and I just can’t find an answer online. And I thought it would be so easy to find answer for that question. Anyway, I have to make a code, what changes brightness of your picture by 40% and then by 90%, but it should be the same code with different numbers. But even when I’ve tried to google something like “making image brighter” or “changing brightness”, nothing what I wanted popped up…

Thanks for help

E: I tried ImageAdjust[img, {0, 1.4}] but nothing has changed. I assume it’s badly written code.

2

Welcome to Mathematica!

The Mathematica commands to look (in order of complexity) for are:

Lighter
ImageAdjust
BrightnessEqualize

I am confused by your notion of x% brightness? What’s 100%?

Last but not least, when it comes to programming in the Wolfram Language, have a look at

Happy computing!

3

Well I guess 100% is the picture as I import it.

I used qrcode = Import[“folder”], so we can say it has “100%” brightness. And I’m supposed to make it 140%.

The teacher wants to see, that it’s really brighter by 40% in code.. But I have no idea how and I had a look on those commands, but I can’t write the code correctly probably.. I’m missing something big while programming in Mathematica.

Oh, and thank you for welcoming.

e: is it possible that i use ImageAdjust[qrcode, {0, 1.4}] = the brightness should be now 140%?

4

On the off chance that you’re a Mac user, take a look at ‎Basic Image Processing In Mathematica by Peter Boardman on Apple Books