How to batch-convert JPG files to uncompressed TIFF

images jpeg imagemagick tiff image-conversion

13,225

Solution 1

If you use imagemagick? and say

convert -compress none *.jpg Picts.tiff

Tell me if it works right for you

Solution 2

Once an image is converted or created in jpg format, the detail is lost.

The "compression" in jpg is not like a zip file in which the file is made smaller but every bit still exists. Jpg uses lossy compression -- this means that some data is lost during the compression process.

The best you'll be able to do is to have a tiff file with the same quality as your (compressed, lossy) jpg.

To do better, you'd have to recapture the original in a non-lossy format.

13,225

klijo

Updated on September 18, 2022

Comments

klijo over 1 year
I need to collect 1000 uncompressed TIFF files. I have a large set of JPG images, so I decided to convert them to TIFF format. The loss in quality is ok in this case for me.

I used the following command to convert a folder of JPG images to TIFF:
```
mogrify -format tiff *.jpg -compress none
```
Even though I included -compress none, it somehow uses JPEG compression. How can I convert JPEG files to uncompressed TIFF files then?
- henry700 about 12 years
  
  How have you determined that the resultant tiff file uses jpg compression?
- klijo about 12 years
  
  using imagemagick identify tool
- henry700 about 12 years
  
  can you provide the dump?
- klijo about 12 years
  
  i ask it for a question and here it is superuser.com/questions/402829/…
- henry700 about 12 years
  
  sorry, i meant can you provide some information that specifically says that it is a tiff file with jpeg compression after it is converted? Your link provides no ouput from a tool etc which would indicate what the compression method is.
klijo about 12 years

actually my problem is i need a collection of 1000 files in tiff format, and there is no other method of obtaining them other than converting jpg's to tiff. Therefore converting jpg to tiff is ok for my purpose.
henry700 about 12 years

TIFF supports lzw, zip, and jpg compression within the format via extensions. jpg compression handling is rare in tools, but Photoshop (for instance) supports its use.
klijo about 12 years

well tiff is able to store uncompressed format as well
klijo about 12 years

Iam not interested in the end quality of the converted images. I only need a collection of tiff files. Thats all
Doug Harris about 12 years

Yes, use convert instead of mogrify