JPEG compression

[marten]

Hello

I want very simply compress JPG images.
I use this command :
nconvert -overwrite -c 5 -greater_than filesize 1000000 C:\Users\Marten\Desktop\TESTFOTO\%\*.jPG
But .. no compression also no compression with
nconvert -overwrite -c 8 -greater_than filesize 1000000 C:\Users\Marten\Desktop\TESTFOTO\%\*.jPG
what am i doing wrong ?
thx for help

[cday]

For JPEG output the compression level is set by the following term:

Code: Select all

-q value          : JPEG/FPX/WIC/PDF/JPEG2K/WebP quality (default : 85)

For example:

Code: Select all

-q 75

You may also need the following term:

Code: Select all

-out jpeg

So to be sure:

Code: Select all

-out jpeg -q 75

[cday]

I'm sorry, I missed the fact that you are using the -greater_than filesize option which is fairly new.

I think the problem may be that the reference filesize is possibly to be expressed in KiB rather than bytes, you can at least try that.

[marten]

thanks anyway.
i give this a try

[marten]

cday thank you man.
it works perfect
i use now
nconvert -overwrite -q 10 -greater_than filesize 800000 C:\Users\Marten\Desktop\TESTFOTO\%\*.jPG
and automate this every hour
perfect.

[cday]

I assume that when the -greater_than filesize option is used the filesize parameter is expressed in bytes, I recall when the issue came up before asking that the units be included in the help file, but couldn't recall the units actually used.