How can I convert a .png to .jpeg?

[DaveS]

Does not seem to be an option in Mtpaint?

[don922]

Unless I'm missing something the conversion appears to be very simple:

1. Load a .png file into mtPaint (important * )
2. Click File>Save As
3. In File Format section of the Save Image File window select JPEG in the selector

* The File Format section of the Save Image File window does not include the JPEG selection if a .png file is not loaded.

Even though the file will be named xxxxx.png in the Save Image File window it will be saved as xxxxx.jpg.

This is in mtPaint 3.21 included in Puppy 4.12

[DaveS]

Unless I'm missing something the conversion appears to be very simple:

1. Load a .png file into mtPaint (important * )
2. Click File>Save As
3. In File Format section of the Save Image File window select JPEG in the selector

* The File Format section of the Save Image File window does not include the JPEG selection if a .png file is not loaded.

Even though the file will be named xxxxx.png in the Save Image File window it will be saved as xxxxx.jpg.

This is in mtPaint 3.21 included in Puppy 4.12

Oh Sh*t........ how did I miss that! I am sure it did not give me that option before.........
Thanks.

[smokey01]

It is even stranger.

If you load an existing .jpg it does not give you an option to save as a .gif file however, if you load an existing gif file then the option to save it as a .jpg disappears.

[Dingo]

It is even stranger.

If you load an existing .jpg it does not give you an option to save as a .gif file however, if you load an existing gif file then the option to save it as a .jpg disappears.

this can be sound stranger for people ignoring image formats basics:

a GIF format gives a representation of an image/draw using a limited palette (256 colors max)

a jpeg (jpg) format can handle images in milions of colouors, but not indexed images

so, in order to convert a jpg in gif, you must before reduce colors dept, then you will see option to save as a gif

[Indy]

Ah, now I see!

At first I couldn't find the Save as File Format JPEG option either.

I'd created a new image in mtpaint, saved as PNG, re-opened it again in mtpaint, tried to save but still didn't see the Save As JPEG option.

Then I realised that when I created my test image, I used the default of "Indexed Palette".

As per Dingo's post, JPEG doesn't do "indexed".

Once I did "Image > Convert to RGB", when I went again to "File > Save As...". this time the JPEG option was available.

Excellent. Thanks!

(p.s. Now I don't need to jump into GIMP to do this)

[Flash]

It might be helpful if someone would explain what an indexed image is.

[Bert]

It might be helpful if someone would explain what an indexed image is.

Yes, I agree, it shouldn't be taken for granted that we all now what that means..
As often, Wikipedia comes to the rescue here. Not that I understand it all, but it's a start I suppose

Good idea to bring this up, Multisession Master..

[Indy]

Ha, yes. Same. I still don't really know what "indexed" is either, so thanks for that link. I'll try to learn.

By the way, that link to the Wikipedia article has an extra "L" at the end... here's the link again (fixed):

http://en.wikipedia.org/wiki/Indexed_color

[Bert]

Oops.. sorry for the bad link. Thanks for fixing it

Bert

[looseSCREWorTWO]

I use IrfanView in WINE to do stuff like this.

That way I can remain Blissfully Ignorant about all sorts of things, including indexed images.

[Makoto]

There's also a .pet or two (not to mention an .sfs, if I remember correctly) of the Linux version of XNView lurking...

[muggins]

Sam2p does this easily, via commandline:

Code: Select all

sam2p xxx.png xxx.jpg

Write a simple bash script & convert a directory of png files.