Summary of the JNG standard chunks

Name Multiplicity Ordering

JHDR     1        First
JDAT     1+       Interleaved with IDAT or JDAA
IDAT     0+       Interleaved with JDAT; before JSEP
JDAA     0+       Interleaved with JDAT; before JSEP
JSEP     0-1      Between 8-bit and 12-bit JDATs
IEND     1        Last

cHRM     0-1      Before JDAT, IDAT and JDAA
gAMA     0-1      Before JDAT, IDAT and JDAA
iCCP     0-1      Before JDAT, IDAT and JDAA
sRGB     0-1      Before JDAT, IDAT and JDAA
bKGD     0-1      Before JDAT, IDAT and JDAA
pHYs     0-1      Before JDAT, IDAT and JDAA
tIME     0-1      None
iTXt     0+       None
tEXt     0+       None
zTXt     0+       None