1. Material, photos are better than spray painting, spray painting ideas are rough, precision is low, and pigment oil is used, which is suitable for outdoor and buildings; On the contrary, the photo is thin and accurate, and the brightness increases after film mulching, which looks like a photo. So don't spray paint when taking pictures indoors, because the paint is water-based, and avoid ultraviolet rays, otherwise, it will soon fade.

2. Material: the portrait picture is made of PVC with glue on the back, which can be stuck. If you want to go to the wall, you must have a backboard and stick pictures on it. Spray painting is no good, you have to use other tools.

3. Durable time: the durable time of inkjet printing is long, and it can withstand wind, sun, wind, frost, rain and snow, while photos are easy to be damaged and need careful protection or dry environment.

Second, it is mostly used in advertising production. Portrait generally refers to indoor use, and inkjet generally refers to outdoor advertising screen output.

Extended data:

Ink jet principle

1: It is formed by siphon pressure blowing technology which works according to Bernoulli principle.

A: Bernoulli principle: The greater the fluid velocity, the smaller the pressure.

B: Siphon pressure blowing technology: the gas at point A is forced to pass through the horizontal suction pipe, and a low pressure is formed at point B, and the liquid in the bottle is pumped up through the C pipe to form atomization. Two open straws fixed vertically to each other, one of which is inserted into the fixed bottle.

At the intersection of the two pipes, the liquid is impacted by the airflow to form mist, which is sprayed out as mist.

References:

Baidu encyclopedia-ink painting

Baidu Encyclopedia-Pictures