What does a 3Mb photo correspond to?

francie -  
 malodo -
Hello, I just sent a message on the Messaging/Chat, but I think this is not the right address for my question!!!
So! I am posting my message here again.
Could you please inform me what corresponds to a 3MB photo
I have the Image Resizer service to reduce photos:
I have:
320X200
640X480
800X600
1024X768
1280X768
Kind of you to tell me which of the five corresponds to a 3MB photo
-Thank you- *it's urgent

Configuration: Windows 7 / Internet Explorer 7.0

9 réponses

The Braveheart Posted messages 4377 Registration date   Status Contributeur Last intervention   1 334
 
Good evening,

Don’t rejoice too quickly, Francie, because I think it’s time to put some order in your octets, bytes, and other bits.

These three terms are positioned at two different levels of information units. On one hand, you have octet which is referred to in Ko, Mo, Go, or To and byte in kB, MB, GB, and TB. In fact, these two words denote the same concept (information unit), but Francophones will say octet while we Anglophones say byte ----> for example, when you download with IE, you see the transfer rate in kB.

On the other hand, you have the bit which is an information unit expressed in Kb, Mb, Gb, and Tb.

To get one octet (byte), you need 8 bits.

Now:

1. One kilobyte (ko or kB) = 1000 octets
2. One megabyte (Mo or MB) = 1000 ko = 1,000,000 octets
3. One gigabyte (Go or GB) = 1000 Mo = 1,000,000,000 octets
4. One terabyte (To) = 1000 Go = 1,000,000,000,000 octets.

Here be careful because some will tell me that 1 Ko or kB = 1024 octets. That’s false because since December 1998, the international IEC organization ruled on the matter.

Now 1 octet = 8 bits. So 1 Mo or MB = 1,000,000 octets = 8,000,000 bits = 8 Mb. ------> your 3 Mb = 3,000,000 bits = (1,000,000 octets / 8) * 3 = 375,000 octets = 375 ko.

So you must not exceed 375 ko or kB for your photo.

Now, the size of your photo, to fit into this constraint, depends on its format (tif, png, jpeg...), its dimensions, its quality, colors, etc.

One last point, as Transat says, the size of a file (photo, text, video, or other) is expressed in ko, Mo... (or in kB, MB ... if the software is in English) but never in Mb (at least not to my knowledge) ---> I presume your 3 Mb is a typo for 3 MB!

Have a good evening.

@sirigami, it's the first time I've been cracking up reading your posts. Generally, I have headaches. Oh Gosh, talking about d*ck and moreover mega! Not ashamed, right? :D

Best wishes to Transat and Durock.
"How poor are they that have no patience." SHAKESPEARE (Othello).

"To the question: Who are we? Where do we come from? Where are we going?
I respond: I am me, I come from my home, and I return there".
Pierre DAC (les pensées)

THE BRAVEHEART
5
Sirigami Posted messages 186 Registration date   Status Membre Last intervention   6
 
Hello

thank you dear professor for this lesson, and I hope that "bursting with laughter" has deflated your ego.
Once again, thank you for this wonderful lesson, in all modesty.

Have a nice day
0
malodo
 
very clear, thank you
0
transat Posted messages 31956 Registration date   Status Contributeur Last intervention   9 021
 
Hello
And if you right-click on your photos and then on properties, you will surely see the sizes of the respective photos. Then, as they told you,
Chrome and Nyctalope, try several times with Reziser

Curiosity on CCM is not a flaw but a quality.
2
francie
 
OK! Thanks everyone.
But when I click on the photo, it shows in Ko?
for:
-320X200 = 47.4Ko
-640X480 = 83.4Ko
-800X600 = 107Ko
-1024X768= 107Ko
-1280X768= 147Ko
So what does my 3Mb correspond to in Ko???
Thank you very much for your help.
1
Sirigami Posted messages 186 Registration date   Status Membre Last intervention   6
 
Hello

3Mb (Megabyte) corresponds to the weight (amount of information) of your photograph, which takes into account its dimensions expressed either in cm or in Pixels (Width X Height) considering its resolution (pixels per inch or cm).

Have a nice day
0
durock Posted messages 3145 Registration date   Status Contributeur Last intervention   2 629
 
Hello

1 Mb = 1000 Ko
So
3 Mb (or 3 Mo) = 3000 Ko
0
transat Posted messages 31956 Registration date   Status Contributeur Last intervention   9 021
 
Good evening Sirigami
It’s the first time I’ve seen photo sizes expressed in megabits. Usually, it’s in MB or KB.
Have a good evening
--

Curiosity on CCM is not a flaw but a quality.
1
Sirigami Posted messages 186 Registration date   Status Membre Last intervention   6
 
Hello

Yes, indeed it's a mistake, it should read megabyte instead of Mega bite, no mega byte
MB for megabyte.

Good evening
0
Sirigami Posted messages 186 Registration date   Status Membre Last intervention   6
 
0
francie
 
Good evening The Braveheart, Nice of you to share your knowledge, I see that for once you're LOL! That's good, it's nice to laugh!!!

Thank you for your explanations, because as I said I'm useless, I don't think it's a typo, I'm being asked to send a photo in 3MB.
So for you, I shouldn't exceed 375KB, I compared several photos and indeed as you pointed out, it all depends on the color, quality, etc... in Image Resizer I need to reduce to 1024X768 which is equivalent to: between 293KB and 300KB, but that's already a good size for a photo.
Best regards, and thanks again.
1
Chrome
 
It can be any of these resolutions, the important thing is to know the type of coding of your file, that is to say its extension > jpeg gif tga ?...
1
francie
 
Thank you Chrome for your information, but I don't know the type of coding, I'm terrible!!!
These are photos to send to a forum where it says:
the photos must be of size less than or equal to 3Mb
if you can tell me more, it would be nice of you to reply. -Thank you-
0
Nyctaclope Posted messages 5295 Registration date   Status Membre Last intervention   1 254
 
Hello

Agreed with Chrome ...

The only solution is to make several copies of the original and test multiple reductions ...
Probably one of the last two, for example in jpeg.

See you later
Nyctaclope

The most beautiful poem in mathematics: e^(i.PI)=i^2
three "sacred" numbers from different horizons coming together ...
0
Chrome
 
If what your software indicates is correct, even at maximum resolution, I don't see where the problem is. You're far from 3MB, so save your file with the maximum resolution and use 'Save As' in the file menu. Of course, if you save it with the same settings as the original, the file is likely to be the same size, so in the 'Save' menu, make sure to select 'Save As' instead of just 'Save'.
0
francie
 
A big thank you to everyone for your help.

Thank you Sirigami for sending me the "Wikipedia" site, I learned about baïte!

Thanks also to durock who clearly answered my question, and I understood that 3Mb = 3000Ko
My photo is in large format at 3000Ko!

I am now knowledgeable in Mb and Ko! but I’m not K.O! LOL...
HAVE A GREAT EVENING everyone and kisses
0