How to fix photoshop error "not enough Memory (RAM)|| can't use quick selection tool

fix your issue by these simple steps. i know you have enough ram but still photoshop showing not enough memory . okay to fix it 1. Go to regedit 2. CLICK ON HKEY USER 3. click on software 4. then adobe then photoshop in photoshop set new Dword 32 bit and name it as OverridePhysicalMemoryMB set vaue data 240 and click on checkbox hexadecimal it done. enjoy