Any image-editing software, such as the open source GIMP , allows you to easily produce a smaller file. Simply open the large file, choose an "image size" or "scale image" function, select the width you want, remembering that px is often full-width, and save in an appropriate file format. The other thing to be aware of with images is the different advantages of the different kinds of compression and file format.
As mentioned above, JPEG files also called. They store a full range of colours but do lose a certain amount of fine detail; there is a balance between the file size and the acceptable amount of distortion. Mostly you will want a mid-range JPEG quality around 50 out of The other main formats used on the web are PNG or the older GIF , and these are "lossless" formats that are not suitable for photographs or full-colour scans of artwork.
However, for images such as line drawings or logos that have been created on a computer in the first place, choosing PNG allows areas of flat colour to be compressed very efficiently and maintain the sharp edges of a design that JPEG would lose. PNG also tends to be used for smaller images, as for larger images the size reduction from using JPEG is much more important. The following images illustrate the reason JPG is not used for small files with only a handful of colours:.
When you attach a file to an email, it will usually be converted to "base 64" text, which can only represent 6 bits per character. This means a 1 MB file will produce an email of about 1. Data transfer speeds can be measured in bits usually for the rating of the connection itself or bytes more commonly for actual download or upload speeds, and shown with a capital "B".
The conversion factor is usually 8 bits to 1 byte excluding now-rare parity or stop bits. So an old dial-up modem might upload and download at 32kbps, but that is only 4 kBps or bytes per second. To summarise, thinking early on about making a file of a size that is easy to transmit and convenient for the recipient can save lots of people lots of time and storage later on.
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Find more ideas tagged with: Back to Idea Exchange Previous Next. Occasional Participant. I use to be able to upload a file of 8mb and now I can't it will only allow 5mb! Now what? Why is now telling me my file has to be just 5Mb? I sell art, I need images for my brochure I attempted to upload 5. It took me literally 2 hours to manipulate my document so that it would be smaller than 5. I request that you increase the upload file size, otherwise, I have absolutely no use for Constant Contact anymore.
I used to be able to upload up to 10M, why did it change to 5MB limit? Internet bandwidth can also represent the maximum speed an internet connection can have. However, when moving a file from one computer to another, the maximum transfer speed will depend on the slowest bandwidth that the data has to go through - which can be anywhere in the route.
To better understand this, let us consider an example. Let's say that your friend wants to send you his new MB megabytes video creation over his 10 Mbps megabits per second internet connection.
On the other hand, you will be receiving the video file over your 5 Mbps home internet connection. For this example, let us assume that the upload and download speeds for both connections can use their entire bandwidths. Since the file will also be coming through the much lower 5 Mbps connection, this will be the maximum transfer speed that we can get for this data transfer. But, to determine the upload and download speeds of your connection, you can use any third-party speed test applications that can be accessed online through your browser.
Now that we know how to determine the transfer speed for our uploads and downloads, we can now calculate a file's download time or duration.
Calculating download time is as simple as dividing the size of the file you wish to transfer by the transfer speed of the network that the transfer will go through. However, we have to be careful with the units we use, since this could be quite confusing.
Let us consider the example above for our sample computation. To calculate how long to download the MB video over a 5 Mbps internet download speed, we can use the equation below:.
But first, let us convert the units of the file size in terms of megabits, which is equivalent to 1 million bits. To do so, we'll be using the conversion table above under the SI system.
With that said, we now have this computation:. As shown above, the MB video file will finish downloading in less than 11 minutes over a stable 5 Mbps connection. However, if somebody else in the house uses the internet while you're downloading this video file, it could take much longer to complete the download because of congestion in the data transfer.
Aside from calculating the download time of a file from the internet, you can also use this calculator to determine the transfer duration from, let's say, a computer to an external storage device like a USB flash drive. However, you must first know the transfer rate of your connection to calculate the transfer duration. You can also use this download time calculator to determine your download speed. However, for this, you have to time how long to download a particular file.
Then, by entering the file size and the download time in our calculator, you'll be able to calculate your internet's download speed. Showing 1 - 15 of 21 comments. Seretti View Profile View Posts. Try other download regions. Originally posted by Seretti :.
Aesthetic View Profile View Posts. Originally posted by Nightenhelser :. Last edited by Aesthetic ; 21 Feb, am.
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