Mason83 wrote:
On 15/01/2016 23:29, Ray_Net wrote:

The last question could be: How can we modify a parameter in SM in such
a way that we can modify the compression force when inserted in an html
mail ?

In about:support "Extensions", do you see these extensions?

Auto Resize Image
Auto Compress File
Auto Resize JPEG

The documentation for what you are doing is probably this:
http://kb.mozillazine.org/Creating_complex_mails_with_inline_images#Drag_.26_drop_images

From that link:
Compared to using the "Insert" menu or drag & drop method, pasting will usually 
involve recoding of the image, thus may change quality and size. Thus, the other two methods 
are preferred to retain the original format of an image.

That suggests that using Insert > Image *doesn't* recode the image. So if you want to control the compression used, perhaps the easiest way is to use an image editor (e.g. GIMP) to save a copy of the file with the desired compression, and use Insert > Image to include that file as an image in the email.

Whatever size the file is on disk, it will add about 1.37 times that size to an email due to the encoding (assuming base64, which is usually used for binary attachments), plus a few hundred bytes of headers. So attaching a 74.8kB file will add about 103kB to the email size.

Mark.

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