Eagle

[Request][Solved] Saving JPEGs with interlacing?

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Eagle    0

Hey guys,

I'd like to know if there's a chance that PDN will offer an option to save JPEG-files with interlacing since PSP or PS can do this and IMHO Gimp can do it, too.

Thanks in advance,

Martin.. :)

Edited by Eagle
Request fulfilled.

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Hellfire010    0
????

"Interlace is a technique of improving the picture quality of a video transmission without consuming any extra bandwidth. It was invented by RCA engineer Randall C. Ballard in the 1930s [1] [2]. It was ubiquitous in television until the 1970s, when the needs of computer monitors resulted in the reintroduction of progressive scan. While interlace can improve the resolution of still images, it can cause flicker and various kinds of distortion. Interlace is still used for most standard definition TVs, and the 1080i HDTV broadcast standard, but not for LCD, micromirror (DLP), or plasma displays, which are inherently progressive scan. These devices require some form of deinterlacing which can add to the cost of the set. Nevertheless as of 2006, progressive displays now dominate the HDTV market."

-Wiki

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Eagle    0

Hellfire, thanks for making this clear. :)

I do need interlacing because of images being shown faster (less quality is ok, since it updates the quality level with every reload) on the web instead of loading images line by line.. - AFAIK, there are tools around which can even control *how many* times the procedure repeats itself till the final image is shown.

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TinSoldier    0

Interlacing image files is not the same as interlacing video images.

With image files it is mostly used as Eagle said. Instead of the image file appearing on a webpage from top to bottom it shows up kind of spread out and the viewer can get an idea of the whole picture before it is completely downloaded.

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BoltBait    1,234
6 hours ago, Eagle said:

@Rick Brewster, can this at least be put onto the roadmap for PDN?

 

Since you are literally the only person in the world requesting this feature, I wouldn't hold your breath waiting for it to be implemented.

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Eagle    0

Sure, I'm obviously the only person requesting it so far. But I find it hard to believe that I'm the only person in need of it.

Interlacing is _the_ technique when it comes to loading and rendering images on small-bandwidth devices (e. g. mobile phones on lower networks with EDGE or something like that) whenever you want to prevent that "line by line"-loading misery.

 

I didn't ask for an implementation, not even "right now, because you have to". I politely asked to put it onto the roadmap for "vANY".

 

But alright, I get the point of yours.

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Eagle    0

While I'm thankful for that hint, it seems that OptiPNG doesn't support interlacing of JPG files. :(

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Yeah. JPG was specified.

 

Not sure why you want to save in JPG, though, there are better formats out there (depending on what type of graphics you are working with).

 

If you are working with any sort of transparency, animation or just want to preserve quality... then JPG isn't for you. WebP, an opensource format, is similar to PNG except that it supports animation (to my knowledge), and has an option for lossy compression (though it is still a lot smarter than JPG, and thus will have less of a loss in quality). You can actually get a plug-in for Paint.NET to support WebP graphics.

  • Upvote 1

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Eagle    0

Unfortunately, it's less about what is technically possible, but instead more about what the customer requests.. :-/

 

But again, I'm thankful for the additional hint about WebP. I didn't even know it exists.

Edited by Eagle

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null54    191

What you are referring to as interlacing is known as a Progressive JPEG.

 

My Optimized JPEG file type plugin supports saving progressive JPEG files, it uses jpegtran to optimize JPEG images.

To use it you would select the Progressive radio button in the Encode Options.

  • Upvote 2

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Eagle    0

Thanks, @null54 for the link. Indeed, I meant progressive JPG.

 

But just like OptiPNG, downloading the files, copying them into [PDN-root]\FileTypes folder, (re-)starting PDN and saving a blank image as either JPG or PNG just brings up the normal PDN dialog, no enhanced features are shown.

 

Are you guys willing to help me out one more time? :)

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BoltBait    1,234

When installed properly, it will show up under File > Save As... > Save as type:

 

SaveAs.png

  • Upvote 2

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Eagle    0

Well, restarting PDN for a second time (just started it to double check I'm not blind) offered me those options.

Thanks again, issues resolved! :)

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