Скачать или смотреть Hour 622 - value, form, technical skill

This card is adapted from 'Colour and Light' by 3D Total.

This was some work for today's session on thinking about value changes with plane direction.

It's funny because Scott Robertson mentions the 50% rule, and I always used that and got good results, but it's not actually true. Seems that if a 90-degree plane facing the light source bang on is 100% value, then a 45-degree plane will not be 50%, but closer to 65%.

Then, as you get more and more angled away from the light, the darkening speeds up so that it quickly drops down from maybe 40 to 0 across just a few degrees of angle change.

This is called an exponential drop in value.

Either approach is fine and actually I find I start with the Scott Robertson 50% rule working from life as I did here, and then I adjust with the more 'correct' approach, but honestly I just copy what I see and I think over time you get used to what value should look like when working from imagination.

This was painted from observation.

This took 45 minutes, using Photoshop.