William Wong

I am trying to export a totally white matrix (with setall 255 255 255 255) to a PNG file. However, the result file has colour 244, 244, 244. Anyone have a clue how can I make it 255, 255, 255 ?

export-a-totally-white-matrix-to-png-not-255

I get all values of 254, which is probably what you meant. And yes, it should be 255. Seems like a bug. Cycling?

I get all values of 254, which is probably what you meant.  And yes, it should be 255.  Seems like a bug. Cycling?


Cycling, any hot fix possible or any workaround at the moment ?

Christopher, you're right, I made a typo as 244 which should be 254.

i'll see if there's anything obvious that we are doing, but my assumption is that it's simply a rounding error and not much to be done.

if you describe in more detail your end goals, perhaps i can suggest a workaround.

i'll see if there's anything obvious that we are doing, but my assumption is that it's simply a rounding error and not much to be done. 

if you describe in more detail your end goals, perhaps i can suggest a workaround.


I've had this problem too, not just with 255, but with other higher values, which remap to different values when saved as a png-- it was in max 6 on a mac; I assumed it was some kind of quicktime gamma remapping thing-- very annoying for my purposes at the time, where I needed exact values

FWIW, in my own tests in Max 7.3.3 on MacOS 10.12.3, using jit.matrix 4 char 'exportimage' to both png and jpeg, values of 255 show up as 254 in Apple's Digital Color Meter utility, but when brought back into a jit.matrix 4 char with 'importmovie' they are restored as 255 when viewed with jit.spill. (I hope that's somehow helpful in tracking it down, Rob.)

if you want to roundtrip data from file to Max, probably better to just save the jit.matrix to a binary .jit file (jit.matrix "write" message).

Rob, I also think it is a rounding error too, somewhere between jit.matrix to PNG conversion.

The reason I am exporting a jit.matrix to PNG file is for printing it out. It is a thermal receipt printer, so (254, 254, 254) background will create tiny splash of black dots like pepper.

Anyone know another way to export PNG from Max ? Or I can send it to another program to export ? My worst scenario would be rewriting the whole generative part with another language.

Export a totally white matrix to PNG not 255