Some image file formats, like PNG or GIF, use only lossless compression, while others like TIFF and MNG may use either lossless or lossy methods.
JPG (= JPEG) and GIF, destroy some of the image data during the file-saving process. For that reason, you should save in JPEG or GIF
only after you're completely done editing, and only if you want to use
the picture for some purpose that requires one of these formats.
In
May 2013 at the Webby Awards, while accepting a Lifetime Achievement
Award for inventing the GIF format, Steve Wilhite used his platform to
state definitively: "It's pronounced JIF, not GIF."
Wilhite
and his team initially intended and specified the pronunciation with a
soft 'G' (or jif), deliberately echoing the American peanut butter
brand Jif's slogan: "Choosy programmers choose... 'jif'."
Save
the MS-Word file as a web page (File (menu) > Save As > Web
Page). Do not save as a filtered web page ("Web Page, Filtered")
because the image resolution will be reduced. All graphics will
now be saved to a folder (in the location you chose).
Rename
the MS-PowerPoint (.PPTX) file or MS-Word (.DOCX) file as a .ZIP
file. When you open the .ZIP file, you will find all the graphic,
movie, and audio files in the Media folder.
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Spacer.gif
is a pixel shim. It is a 1 pixel * 1 pixel transparent GIF. If
you would like a copy of it, just right-click on it and Save Image
As... to your local disk.
Image Size - Keep your images as small as possible (resolution, colour depth, file type, etc.). Remember that there may still be some users without a broadband connection.
Warning! - Make a copy of your original image. Work with copies. Never work with the original file (unless you can go to the source and get another copy).
Shrinking Digital Pictures
Resize your images
Constrain proportions
Width: 400 pixels to 600 pixels (px)
or Height: 300 pixels to 400 pixels (px)
Change either Width or Height, not both.
72 ppi (pixels per inch) is adequate for the Web.
Always work on a copy of your original picture file. NEVER work with the original.
Compress
your images with our free online image compressor tool that compresses
JPEG, JPG, PNG, SVG, GIF, Heic and WEBP image files with the original
image quality.
HTML
use the width attribute with the src tag to specify a percentage of the width of the user's screen rather than a specific number of pixels.
Transparency
isn't the only advanced feature that PNG boasts over GIF. PNG images
can also contain a gamma correction value, which is meant to represent
the relative brightness of the display on which the image was created.
In theory, the browser can use this value to display the image at the
exact same brightness on another display. That's all well and good,
except that other image formats and solid colours specified with CSS do
not contain this gamma correction value, so when you adjust the display
of a PNG based on its gamma information, it no longer matches the other
colors on the site.
For this reason, most browsers (including current versions of Firefox,
Safari, and Opera) ignore the gamma correction value in PNG images when
displaying them on the Web. But Internet Explorer does not, and that's
why my PNG images stood out in that browser.
The solution to this problem is to produce PNG images with no gamma
correction information in them, so that Internet Explorer will not
attempt to correct their display. Unfortunately, Photoshop's "Save for
Web" feature doesn't give you that option, so you need to use a
separate tool to strip out the gamma correction information that it
writes.
A great tool for doing this in Windows is TweakPNG.
It's open source and a free download. Simply drag a PNG to the program
window and delete the "gAMA" chunk from the list before saving the
file. While you're at it, you might as well delete the "tEXt" chunk as
well, to save a few extra bytes of file size by removing Adobe's stamp
on the file.
PNG was designed for transferring images on the Internet, not professional graphics, and so does not support other color spaces (such as CMYK).
PNG itself does not support animation.
PNG offers a variety of transparency options.
PNG-8 - 8-bit - similar to GIF - more advanced compression than GIF, lossless compression
PNG-24 - 24-bit - similar to JPEG, lossless compression, may be larger than JPEG
offer
DivX files in a highly compressed version of the MPEG-4 format used by
corporate outfits like Microsoft and Real Networks. Because of
the powerful DivX compression technique, which is called a codec, these
files can be relatively small and yet contain high-resolution movies
that play in full digital grandeur on a PC or Mac monitor.
A
free web-based video editor that is completely private, compatible
everywhere, and available to use without any sign-in or
account-creating requirement. Runs in your web browser. No ads.
You’ll
need Chrome or another Chromium-based browser like Edge, Brave,
Vivaldi, or Opera to use this tool. Wide.video doesn’t work in Firefox.
Wide.video
runs entirely in your browser and does all the work on your own
computer, no data of any sort is shared and no personal information is
required to use the service.
A good option is the open-source VLC player app or the Apple Safari browser.
MP4 - "There are quite a few free video converters you can download and use, but for my money, Handbrake is the gold standard. Like WebM, it's free and open source."
ClipGrab - Free YouTube Downloader & Converter
ClipGrab is a free downloader and converter for YouTube, Vimeo,
Facebook and many other online video sites. It converts downloaded
videos to MPEG4, MP3 or other formats in just one easy step.
Start > type "terminal" or "wt" > Run as Administrator > ...
YouTube
isn’t the only website Yt-dlp supports; you can download media content
from over 1700 websites, including Twitter, BlueSky, Steam, Facebook,
and Instagram.
Create a configuration file named yt-dlp.conf in the appropriate directory and specify the download location there.
yt-dlp -P "C:/Your/Path/Here" [URL]
Adding
option -P home:<directory-path> (replacing <directory-path>
with whatever the path to destined directory is), will download into
that folder without tinkering the output format. yt-dlp.conf is in the
home path.
In the past, YouTube videos were Flash-based, so your download was an FLV file, but those tend to be harder to play back. MP4, short for MPEG-4 Part 14 multimedia format, plays everywhere.
"Premium status required. Without Premium status, an HLS or MPD download can only be performed 2 hours after the previous one." (i.e. Only one video download every 2 hours.)
Complicated to get set up and there are annoying
warnings that you must register the CA$55 / US$30 converter.
Annoying logo (QR code) is always in the video.
CA$55 / US$30 "registration" is required if you don't want the
"DownloadHelper logo"
in the video, if you want to
convert videos directly to mp3 audio files, if you want
access to support for the conversion feature. Your lifetime license never expires.
Copy a URL from a YouTube video, then open up VLC.
From the Media menu select Open Network Stream(Ctrl+N) and paste in the
URL. Click Play. When the video is playing, go to Tools > Codec
Information. There is a box at the bottom called "Location" or
"Source". Copy the URL you find in that box.
Go
back to your browser and paste the URL (it's a temporary web address
and will expire eventually) into the address bar and start playing the
video. When you're viewing the video in the browser, you'll see an
option to download the file to keep locally. (or Right-click and "Save
As" MP4).
In PowerPoint 2013, you can insert and playback many different video and audio file formats.
For the best video playback experience, we recommend that you use .mp4 videosencoded with H.264 video (a.k.a. MPEG-4 AVC) and AAC audio.
For audio, we recommend using .m4a files encoded with AAC audio.
Important Certain older video file formats may not compress or export properly in Office on a Windows RT PC.
Instead, use modern media formats such as H.264 and Advanced Audio Coding (AAC), which PowerPoint 2013 RT supports.