| smbhax [sys=PC; cat=Utility; reg=PAL] |
| | | https://www.irfanview.com/
Image viewing and converting program, upon tweaking with options its easy to use it to scroll through a directory of images, for instance, and you delete ones you don't want on the fly.
You can script it, for instance I have it set up so right-clicking an image like a TIF will give me a context menu item for converting it to PNG using a call to IrfanView in a .bat file:
~~~
"C:\Program Files\IrfanView\i_view64.exe" %1 /convert="%~dpn1.png"
del %1
~~~
When needed I further compress indexed color PNGs (from Photoshop) through https://compress-or-die.com/png ; I was looking at using webp instead, which IrfanView supports, but a) webp isn't supported by IE (now replaced by Edge of course) or old versions of other browsers, and b) while for instance an 80% compression webp of say the large version of https://smbhax.com/?e=0048&d=0027 is 268K, sharper than the 333K ~80% jpg version (that's from Photoshop's weird "6" scale; 80% from IrfanView is actually 314K), webp does lose some of the warmer, ie red tilted, purples in the image--they go gray instead. So you're losing color data and keeping maybe less noticeable--until you zoom in, where it's obvious--noise detail. So I think I'll just stick to .jpg for non-indexed color images.
tumblr converts indexed .gif to lossless indexed .webp, which is kinda neat; they're slightly smaller file size than say the compress-or-die png versions, although those are already pretty small. tumblr is now also converting animated gifs to animated .webp, which is significantly smaller.
(tumblr converts even indexed .png to .jpg, which--from indexed .png--are considerably larger files, and not as sharp. Blargh. So upload indexed color images to tumblr as .gif so the index gets preserved in lossless and smaller .webp.) |
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| | | | (^ .webp web browser compatibility info from https://caniuse.com/?search=webp) |
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| | | | tumblr is no longer converting to .webp (you can't even upload animated .webp there anymore ; D), the other online and offline free tools I checked only save out animated webps at larger file sizes 'p' than the gifs as which they started, and IrfanView doesn't let you save an animated .gif at all, so I'm using the Google command-line utility gif2webp (entry 2089) for converting animated gifs to (smaller file size) webps. |
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| | | IrfanView's static gif to webp conversion comes out VERY slightly more efficiently than the simple conversion I'm using with gif2webp; possibly by tweaking some command line parameters I could pull gif2webp ahead in that department but I'm not at all certain about that...
Ah no wait gif2webp's highest compression level made an animated webp slightly larger than its default compression level did, but it makes a static webp slightly smaller than IrfanView does. Nifty. So I guess I'll use gif2webp with THAT setting for static images, rather than IrfanView (which I still use for general image viewing). |
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| | | | Oops nope I misread it, IrfanView's conversion is very VERY slightly more efficient in terms of file size. |
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| | | As with gif2web, get smaller file size with webp compression method 3. gif2web still beats it, though (and tumblr beats both).
compress-or-die.com's webp compressor is significantly better than any of them--although much slower--but apparently it's shutting down at the end of the month. |
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| | | | It says "For the technical enthusiats: Uses imagemagick, cwebp, exiftran, exiftool, puppeteer and a lot of custom code." |
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| | | "cwebp" https://developers.google.com/speed/webp/docs/cwebp is a google thing like gif2webp--and downloads in the same collection with it--but it converts from png, jpeg, tiff, and webp.
Hm and it does it better than irfanview for my comic tifs. |
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| | | (compress-or-die.com for instance gets a 37.3 K gif to 29.11 whereas gif2webp combined w/ cwebp only gets it to 30.4.)
I tried imagemagick (again) but it's just using cwebp--same commands and result, at least for lossless.
compress-or-die shutdown info: https://www.reddit.com/r/CompressOrDie/comments/1ueh58i/cod_says_goodbye/ |
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| | | | (IrfanView gets that same gif to 30.64. tumblr gets it to 30.58. gif2webp w/ cwebp gets it specifically to 30.47. (gif2webp along gets it to 30.57.)) |
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| | | | (((^ "alone" not "along" ; D))) |
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