Closed:What is the meaning of normalize signal intencity in microarray and how to extract fold change or lFC from normalize signal intensity?

Question

[Calangoa]

Hi I have a question about microarray, What is the meaning of normalize signal intencity in microarray and how to extract fold change (gene expresion) or lFC from normalize signal intensity? Is it possible or correct to caculate ratio of treatment signal intencity/control signal intensity to achieve to Fold change or lFC?