One of the best things about the laser is the versatility. A lot of different materials can be engraved and even cut, which gives us the opportunity to make a variety of products.
The downside to having so many material options, is that each material has it's own optimal or perfect laser settings to achieve the best results. Now, keep in mind that "perfect" is subjective and up to personal preference. Where one person may like a lighter engraving color contrast, someone else may like a darker color contrast.
Using this grid method is a great way to find out what different settings will look like. This can take a while to machine, but will be a great resource for as long as you own a laser.
When using this file, you may need to run one row at a time using the color mapping option. This will allow you to specify the power and speed for each RGB color code. This will save time on producing this file versus machining one square at a time.
This file is meant to be a guide and may need to be altered depending on the make and model of your laser. If you have any questions, feel free to contact me.