Digital Cameras Forum

Digital Cameras Forum Discuss compact digital cameras or ask general digital photography questions - what camera to buy, memory cards, digital camera accessories, etc. You may also want to look at the Digital SLR forum, or the Camera Manufacturer forums.
Digital Camera Pro Reviews >>
Read and Write Digital Camera Reviews >>
Digital Camera Buyers Guide >>
Results 1 to 10 of 10

Thread: megapixels?

  1. #1
    Member
    Join Date
    Jun 2010
    Location
    Waterbury ct usa
    Posts
    52

    megapixels?

    Hi my camera a GE A1255 has 12.2 megapixel spec. But I have not seen a pic over 6.2 meg with most around 4 meg,s. what kind of subject would you need to use the 12.2 megs?

    Thank,s Rob

  2. #2
    Senior Member OldClicker's Avatar
    Join Date
    Aug 2008
    Location
    Mundelein, IL USA
    Posts
    4,075

    Re: megapixels?

    Quote Originally Posted by ct-rob
    Hi my camera a GE A1255 has 12.2 megapixel spec. But I have not seen a pic over 6.2 meg with most around 4 meg,s. what kind of subject would you need to use the 12.2 megs?

    Thank,s Rob
    MP is the resolution of the image (number of dots). I think that you are looking at the file size, correct? Not the same thing. - TF
    -----------------
    I am no better than you. I critique to teach myself to see.
    -----------------
    Feel free to edit my photos or do anything else that will help me learn.
    -----------------
    Sony/Minolta - way more gear than talent.

  3. #3
    Member
    Join Date
    Jun 2010
    Location
    Waterbury ct usa
    Posts
    52

    Re: megapixels?

    Thank,s I thought it was related .

    Rob

  4. #4
    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
    Join Date
    Mar 2004
    Location
    UK
    Posts
    11,750

    Re: megapixels?

    If you're shooting with JPEG then the size can be as small as 1/3 the expected number of megapixels.
    JPEG compressed the image by throwing away parts of it (lossy compression) and if you enlarge them a lot, or go peeking at individual pixels, you may see blocky patterns in areas of more or less the same colour.
    Normally it doesn't matter, as your eye/brain tends to fill in the details.
    PAul

    Scroll down to the Sports Forum and post your sports pictures !

  5. #5
    Member
    Join Date
    Jun 2010
    Location
    Waterbury ct usa
    Posts
    52

    Re: megapixels?

    yes their must be a lot of blocky patterns if every pixels data was recorded the file size should not very to much.

    Rob

  6. #6
    Junior Member
    Join Date
    Apr 2005
    Location
    Brooklyn NY
    Posts
    13

    Re: megapixels?

    If you set to max, use Fine instead of Economy to get full res, but file size is much bigger.

  7. #7
    Senior Member Anbesol's Avatar
    Join Date
    Mar 2006
    Location
    Kansas
    Posts
    3,430

    Re: megapixels?

    Color is whats most effected by jpeg compression, not line detail (or, only as it relates to color). Tonal graduations become less and less smooth the greater the compression.

  8. #8
    Junior Member
    Join Date
    Apr 2005
    Location
    Brooklyn NY
    Posts
    13

    Re: megapixels?

    Quote Originally Posted by Anbesol
    Color is whats most effected by jpeg compression, not line detail (or, only as it relates to color). Tonal graduations become less and less smooth the greater the compression.
    That is interesting. Are you saying FINE pics are more colorful than ECONOMY?

    6mp, Economy, file size 1.1mb, zoomed 200%, distortion and halo around edges.
    Same scene, 6mp Fine, file size 3.56mb, zoomed 200%, looked ok, less distortion.
    In fact, if you have to zoom that much to see so little difference between Fine and Economy, it's not worth it to use Fine at all as file size is 3x. I use Normal as I found burst mode using Fine useless as it took too long to save to card.

    In fact, I am not certain as to what's happening using Economy, if compression is used then it would take longer to save pics vs. Fine; In fact, opposite is true.

  9. #9
    Be serious Franglais's Avatar
    Join Date
    Feb 2004
    Location
    Paris, France
    Posts
    3,367

    Re: megapixels?

    Quote Originally Posted by Romphotog
    ..

    In fact, I am not certain as to what's happening using Economy, if compression is used then it would take longer to save pics vs. Fine; In fact, opposite is true.
    The file size is bigger with Fine. The bottleneck is not the processing of the image, it's the time taken to write the result to your memory card. In burst mode you're filling up the camera buffer with several images then having to wait while it flushes all the JPG's to card.

    BTW I've never noticed any difference in the colour between more or less compressed JPG's. I find the difference is in fine detail like blades of grass.
    Charles

    Nikon D800, D7200, Sony RX100m3
    Not buying any more gear this year. I hope

  10. #10
    Junior Member
    Join Date
    Nov 2010
    Location
    usa
    Posts
    1

    Re: megapixels?

    thank you

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •