How to adjust Image Quality on the EOS 1Dx Mark III.

Article ID: ART176321 | Date published: 02/03/2020 | Date last updated: 02/25/2020


Setting image quality settings (size, resolution, quality, etc.) on the EOS 1Dx Mark III.


Image Quality

Image Quality

Card/image size selection Image Size Selection

You can specify Large, Medium1, Medium2, or Small for JPEG images, Large for HEIF images, and RAW or Compact RAW for RAW images. Image size can be set in either of the following ways.

Setting size via the rear LCD panel

  1. Press the Card/image size selection button (Timer 06sec).

  2. Select the desired image size.

    • Turn the Quick Control Dial dial to select the image size.
    • Both RAW and JPEG images will be captured when RAW/Compact RAW and Large/Medium1/Medium2/Small are displayed together.
    • Both RAW and HEIF images will be captured when RAW/Compact RAW and Large/HEIF are displayed together.
    • Turn the Main Dial dial to select the card for recording and playback ().


  • To set separate image sizes for each card when [ShootingRecord func.] in [Set-up: Record func+card/folder sel.] is set to [Rec. separately] (), turn the Main Dial dial, select a card, and set the image size.
  • “Image quality” in this guide refers to both image size and JPEG/HEIF quality ().
  • HEIF can be specified when [HDR shooting HDR PQ] in [Shooting: HDR PQ settings] is set to [Enable]. You can convert these images to JPEG images after shooting ().

Setting size via the menu

  1. Select [Shooting: Img type/size].

    • The screen displayed varies depending on [ShootingRecord func.] settings in [Set-up: Record func+card/folder sel.].
  2. Set the image size.

    Standard/Auto switch card/Record to multiple

    • For RAW images, turn the Main Dial dial, and for JPEG images, turn the Quick Control Dial dial.
    • Press SET to set it.

    Record separately

    • When [ShootingRecord func.] in [Set-up: Record func+card/folder sel.] is set to [Rec. separately], turn the Quick Control Dial dial to select [Card 1] or [Card 2], then press SET. Note that recording separately to RAW and Compact RAW is not available for RAW images.
    • Select an image size on the screen displayed, then press SET.


  • In the viewfinder, maximum display of the number of shots available is 1999.
  • Large is set automatically if you set both RAW and JPEG/HEIF to [Dash].
  • Two versions of each shot are recorded at your specified image quality when you have selected both RAW and JPEG/HEIF. Both images have the same file number but each has a different file extension, with .JPG for JPEG, .HIF for HEIF and .CR3 for RAW.
  • JPEG / RAW appears at the right in the viewfinder based on your JPEG/RAW selection.
  • Meanings of image size icons are as follows: RAW: RAW, Compact RAW: Compact RAW, JPEG: JPEG, HEIF: HEIF, Large: Large, Medium1: Medium 1, Medium2: Medium 2, Small: Small.

RAW Images

RAW images are raw data from the image sensor that are recorded to the card digitally as RAW or Compact RAW, based on your selection. Compact RAW produces RAW images with smaller file sizes than RAW.

RAW images can be processed using [Playback: RAW image processing] () to save them as JPEG or HEIF images. As the RAW image itself does not change, you can process the RAW image to create any number of JPEG or HEIF images with various processing conditions.

You can use Digital Photo Professional (EOS software) to process RAW images. You can make various adjustments to images depending upon how they will be used and can generate JPEG, HEIF, or other types of images reflecting the effects of those adjustments.


  • To display RAW images on a computer, using Digital Photo Professional (EOS software, hereafter DPP) is recommended.
  • Older versions of DPP Ver. 4.x do not support display, processing, editing, or other operations with RAW images captured by this camera. If a previous version of DPP Ver. 4.x is installed on your computer, obtain and install the latest version of DPP from the Canon website to update it (), which will overwrite the previous version. Similarly, DPP Ver. 3.x or earlier does not support display, processing, editing, or other operations with RAW images captured by this camera.
  • Commercially available software may not be able to display RAW images captured by this camera. For compatibility information, contact the software manufacturer.

Guide to Image Quality Settings

See Performance Data for details on file size, number of shots available, maximum burst, and other estimated values.

Maximum Burst for Continuous Shooting

Approximate maximum burst is shown at the right in the viewfinder, on the Quick Control screen, and at the bottom of the Custom Quick Control screen.


  • Maximum burst is shown even without a card in the camera, so make sure a card is inserted before shooting.


  • If the maximum burst is displayed as “99”, it indicates that you can shoot 99 or more shots continuously. Fewer shots are available for a value of 98 or lower, and when [buSY] is displayed in the viewfinder and on the top LCD panel, internal memory is full and shooting will stop temporarily. If you stop continuous shooting, the maximum burst will increase. After all captured images have been written to a card, you can once again shoot at the maximum burst listed in Performance Data.


  1. Select [Shooting: JPEG/HEIF quality].

  2. Select the desired image size.

    • Select the image size, then press SET.
  3. Set the desired quality (compression).

    • Select the number, then press SET.
    • Higher numbers offer higher quality (lower compression).
    • Quality of 6–10 is indicated by Fine, and 1–5, by Normal.


  • The higher the quality, the fewer shots will be available. In contrast, the lower the quality, the more shots will be available.




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