Progressive jpg

[dan]

Hi,

I'd like to make sure that my jpgs are NOT interlaced (don't want progressive jpg).

Tried all kind of scripts but didn't get it right...

any advice will be appreciated!!

Thanks

[dan]

I can obviously run:

convert -interlace none image.jpg new_image.jpg

But when I check the file with gimp it seems interlaced...

[fmw42]

In proper IM 6 syntax you need to read the input image first, so try

convert image.jpg -interlace none new_image.jpg

If that does not work, please provide a link to your image. You can host it on any free Image Hosting web site such as dropbox, etc.

Also what version of IM and what platform.

Please see viewtopic.php?f=1&t=9620

[dan]

Thanks!!

Seems like it's doing the trick. I'm checking the file with:

identify -verbose new_file.jpg

and it shows:
Interlace: None

Does it mean that the jpeg is not progressive or do I need something else?

[GreenKoopa]

ImageMagick is great at image processing. It has many options when writing JPEGs. If your command is the last step of a longer process, fmw42's advice is perfect. But if you are only modifying jpeg attributes such as the coding, a jpeg specific tool, such as jpegtran, will work faster and with zero loss of image quality.

[fmw42]

Does it mean that the jpeg is not progressive or do I need something else?

If the verbose info say interlace none, then the resulting jpg is not progressive

see
http://www.imagemagick.org/script/comma ... #interlace

"Use Line or Plane to create an interlaced PNG or GIF or progressive JPEG image.