.tif files versus .jpg files

As a relative newcomer to PS , ( I have PS7 ) , I understand that , if
you want to avoid losses when making adjustments to a photo image file
, one way of ensuring this is to save these files in .tif form as
opposed to the .jpg form which my digital camera automatically does.

I've just saved one of my .jpg files as a .tif file .

This has increased the size of this file from 1147 KB to 9231 KB.
Is this increase in size normal when this change of format is effected
?

B.N.

 

Yes, TIFF is an uncompressed format, JPEG is a compressed format.

 

Thanks for the prompt reply.

Is it then OK to do things like rotate the image and otherwise mess
about with an image in this .tiff format without losing any of the
original detail unlike similar operations with a .jpg image ?

I realise , of course , that , if you want to avoid losses with .jpg
formats , you can always use copies of the originals.

B.N.

 

For the most part, yes. Since TIFF is a lossless format there
should be no loss of image quality which you pay for in image
size.

If you need a JPEG copy do all of your manipulation on the
TIFF (or PSD) file then save a copy or use save for web
which gives you greater control over the compression.

 

Tiff can be saved with LZW compression, which is lossless.

 

Yes, you can, but if the file has once been compressed with .jpg, the
loss has already happened. You can never bring the information back. You
can only avoid further loss, but it cannot substitute an original TIFF
file. You should always scan or record your images in RAW or TIFF, never
in .jpg.

Yes, it is normal.

Per Inge Oestmoen

 

In jpeg, the loss occurs when saving the file. Manipulation
doesn't cause the losses. Jpeg artifacts become more noticeable
after several generations of saves. If your camera saves the
original image in .jpg, and you open it, manipulate it and then
save it again in .jpg, you have increased the losses. If you
then re-open the saved .jpg, and perform further work with the
image, and re-save, you will have further increased the losses
and the jpeg artifacts which will be visible.

-Raf

 

Is this true with the new JPG2000 format?