Applying a soft wash similar to watercolour as a base for additional layers of paint
There was no daylight this was a problem because the artists and painters had differing lighting needs, the painters needed small 110 volt 80watt portable tungsten light at 2500k, the artists needed high power 500watt halogen lighting to maximize illumination covering large areas of the dome evenly, and to approximately match daylight at 5000k to match paint colour, every time I was on site the lighting changed as workers moved around. I needed to get a soft painterly light in my images to match the original painting but the lighting was harsh and mixed I tried various methods to get this right including flash, also a ring flash it gives a softer feel to the light but nothing worked all too harsh. Eventually I used a mix of long exposures (when the scaffolding stopped swaying) and against my better judgment increased the ISO. Increases the sensitivity of the digital sensor.