Add alpha toggle to `read_pixels`
Add alpha toggle to `read_pixels`

dchilds7/Deysha-Star-Formation,julienr/vispy,julienr/vispy,RebeccaWPerry/vispy,sbtlaarzc/vispy,hronoses/vispy,ghisvail/vispy,Eric89GXL/vispy,michaelaye/vispy,hronoses/vispy,RebeccaWPerry/vispy,sh4wn/vispy,Eric89GXL/vispy,RebeccaWPerry/vispy,QuLogic/vispy,kkuunnddaannkk/vispy,bollu/vispy,bollu/vispy,ghisvail/vispy,ghisvail/vispy,dchilds7/Deysha-Star-Formation,srinathv/vispy,michaelaye/vispy,jdreaver/vispy,srinathv/vispy,jdreaver/vispy,jay3sh/vispy,QuLogic/vispy,sh4wn/vispy,drufat/vispy,jay3sh/vispy,jdreaver/vispy,sh4wn/vispy,drufat/vispy,julienr/vispy,kkuunnddaannkk/vispy,michaelaye/vispy,Eric89GXL/vispy,sbtlaarzc/vispy,inclement/vispy,inclement/vispy,hronoses/vispy,QuLogic/vispy,sbtlaarzc/vispy,jay3sh/vispy,srinathv/vispy,kkuunnddaannkk/vispy,dchilds7/Deysha-Star-Formation,inclement/vispy,drufat/vispy,bollu/vispy