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jumeda333
New Participant
March 26, 2018
Answered

File size in CS5

  • March 26, 2018
  • 1 reply
  • 797 views

Hi everyone. I am new at this site so hopefully I am in the right place. I just started using CS5. I have been using CS3. I built a file in CS5 that was 36 x 60 at 200dpi. The file was 247MB when I was done. That was fine. I built the same file in CS5 and it was 1.5GB. The size and dpi was the same. What I noticed was the pixel sizes were different. CS3 was 12000 x 7200 and the CS5 was 30480 x 18288. When I went to save it, it only gave me three options. I then made the file 50% and then I had all my save options. What am I doing wrong? Is there a setting somewhere that tell it what the pixels should be. I really don't want to save my files at half the size every time.

Thank you very much for any help I can get on this.

David

    This topic has been closed for replies.
    Correct answer Abambo

    Yes, you are at the right place.

    You didn’t specify, but I suppose you are an inch guy (as opposed to mm or cm):

    The pixel file size:

    36x60@200ppi should result into 36x200 pixels in one direction (7,200 px) and 60x200 pixels into the other direction (12,000 px). Anything else is not correct! So your CS5 numbers are not correct. I would say your CS5 numbers are cm (1inch = 2.54 cm).

    Colour mode possibilities:

    Then there is the bit depth: you may have bitmapped (black and white, one bit per pixel), you may have indexed (8 bits per pixel, and a table of up to 256 entries, giving 256 distinct colours) or greyscale (usually 8 bits per pixel) or “true colour” 24 bits per pixel (8 bits per colour channel) or 16-bits per colour channel or even 32-bits per colour channel. You will understand that if you put more bits depth in the image, that the image size will grow (1byte is 8 bits). For print you will need CMYK instead of RGB, adding one colour chanel, adding more storage space need. But to make things again more complex, there are also other colour models that have their use. But let’s say that there are for the standard (starting) user 2 colour modes of use: 3x8bits and 3x16bits RGB.

    Your indication:

    This said, you did not say what 3 options you had for saving. And you did not say what you did to “make your file 50%”.

    What I can imagine is that you made your file X bits depth and there not all the save options are available, because not all the file formats support all the bit depth.

    However, in the real world of today, there are only 4 file formats of use (the other have their purpose, but you need to know what you want to do).

    JPEG

    PNG

    TIFF

    PSD

    Of those 4, the PSD file format is the natif one for Photoshop. TIFF and PSD can save all the features that can be saved with Photoshop. PNG saves a flattened picture at max 3x8 bits, that may contain a transparency mask. And finally JPEG saves a highly compressed picture, but only 3x8bits and no transparency. In addition, the compression is destructive, meaning that with each generation you will loose quality.

    1 reply

    Abambo
    AbamboCorrect answer
    Community Expert
    March 26, 2018

    Yes, you are at the right place.

    You didn’t specify, but I suppose you are an inch guy (as opposed to mm or cm):

    The pixel file size:

    36x60@200ppi should result into 36x200 pixels in one direction (7,200 px) and 60x200 pixels into the other direction (12,000 px). Anything else is not correct! So your CS5 numbers are not correct. I would say your CS5 numbers are cm (1inch = 2.54 cm).

    Colour mode possibilities:

    Then there is the bit depth: you may have bitmapped (black and white, one bit per pixel), you may have indexed (8 bits per pixel, and a table of up to 256 entries, giving 256 distinct colours) or greyscale (usually 8 bits per pixel) or “true colour” 24 bits per pixel (8 bits per colour channel) or 16-bits per colour channel or even 32-bits per colour channel. You will understand that if you put more bits depth in the image, that the image size will grow (1byte is 8 bits). For print you will need CMYK instead of RGB, adding one colour chanel, adding more storage space need. But to make things again more complex, there are also other colour models that have their use. But let’s say that there are for the standard (starting) user 2 colour modes of use: 3x8bits and 3x16bits RGB.

    Your indication:

    This said, you did not say what 3 options you had for saving. And you did not say what you did to “make your file 50%”.

    What I can imagine is that you made your file X bits depth and there not all the save options are available, because not all the file formats support all the bit depth.

    However, in the real world of today, there are only 4 file formats of use (the other have their purpose, but you need to know what you want to do).

    JPEG

    PNG

    TIFF

    PSD

    Of those 4, the PSD file format is the natif one for Photoshop. TIFF and PSD can save all the features that can be saved with Photoshop. PNG saves a flattened picture at max 3x8 bits, that may contain a transparency mask. And finally JPEG saves a highly compressed picture, but only 3x8bits and no transparency. In addition, the compression is destructive, meaning that with each generation you will loose quality.

    ABAMBO | Hard- and Software Engineer | Photographer
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