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dkj

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Posts posted by dkj

  1. I have some Kodak Gold negatives that I want to scan, then develop in Affinity Photo. Is there any point in scanning these negatives so I can open them as 32-bit ROMM-RGB files? (My scanner is capable of producing 48-bit DNG files.) i.e. Would I get any more detail from such a file than from a 16-bit TIFF scan? In other words, I'm not sure how much dynamic range is in a colour negative.

  2. I came up with this process:

    1. Select File:NewBatchJob on the menu.
    2. Add the RAW files to the list.
    3. Check Save As TIFF with these settings:
      • Pixel Format: RGB 32 bit.
      • Resampler: Bicubic.
      • ICC Profile: ROMM RGB
      • Compression: None.
    4. Select Save Into and select or create a directory for the TIFF files.

    Then use the TIFF files to create the stack. The new images will have the ROMM RGB profile. 

    I'm hoping this will preserve the colour data present in the original RAW file. Is there some way to check whether this is so? 

  3. 6 hours ago, stokerg said:

    Hi dkj,

    When you stack RAW files, there aren't any settings from the Develop Persona applied due to it using a different pipeline for batch processing.  You'd get much better results by processing the RAW files individually via the Develop Persona, export them and then stacking the processed images

    Thanks for your answer. Processing the RAW files individually would be rather inconvenient if I'm stacking a dozen or more images. But all I do in the Develop Persona is use the ROMM RGB output profile. Might there be some way of automating that? Or some other way of ensuring the output of the stacking preserves the extra data?

  4. I've followed James Ritson's video tutorial on replicating the technicolor effect in Affinity Photo.

    https://player.vimeo.com/video/155520871/

    I've followed the steps carefully, and checked to make sure that all recolour values were set as stated in the video (R=180, G=300, B=60). But I get yellows transformed into a shade of pink.

     

    Can anyone suggest what I might be doing wrong? I'd really like to learn how to use this technique to emulate different types of colour film.

    ColourChart.jpg

    OriginalColour.jpg

    TechnicolorChart.jpg

    Technicolour.jpg

  5. On 2018-03-31 at 5:27 AM, owenr said:

    An adjustment modifies the colour/opacity of a pixel without regarding its neighbouring pixels or computing a colour from a pattern/image to combine with it.

     

    Many filters modify a pixel by a function which uses several pixels in the neighbourhood of the pixel as input. You'll be aware of the radius parameter of blur and sharpening filters, and the Shadows/Highlights filter (not the Shadows & Highlights adjustment), which allows you to vary the size of the neighbourhood.

    The distortion filters such as Perspective or Ripple do not have a radius parameter, but the new colour/opacity of a pixel is determined from multiple pixels to reduce aliasing (jaggy edges).

    There are further types of filter such as those which add noise or the Lighting filter, which combine a computed pattern or image with the pixels.

     

     

    Thanks for this. So is this why live filter layers are nested by default: i.e. to keep them from having to compute what any other filter or adjustment layers have done to the original image?

  6. (My apologies if this same procedure has been posted previously.)

    Suppose you have two adjustment/filter layers called "SourceLayer" and "DestinationLayer".

    Suppose you've created a mask on SourceLayer, so that it affects only part of your image.

    Suppose you want DestinationLayer to affect only that same part of your image.

     

    1. Select SourceLayer.
    2. On the Channels tab, right-click SourceLayer Alpha.
    3. Choose Create Spare Channel from the menu.

    4. [Optional] Rename "Spare Channel" to "SourceLayer Mask".
    5. Select DestinationLayer.
    6. On the Channels tab, right-click the icon of SourceLayer Mask.*
    7. Choose Load to DestinationLayer Alpha from the menu.

     

    DestinationLayer will now affect the same part of your image as SourceLayer.

    *If you don't click the icon, you won't see the "Load to..." menu selection. This is a (minor) bug in Affinity Photo.

  7. Suppose I add an HSL adjustment layer above my image layer. I then paint the mask of the adjustment layer so that it applies only to a part of the image. Now I want to add another adjustment layer (e.g. shadows/highlights) that modifies only that same part of the image. Is there some way of copying the mask from the first adjustment layer to the second? How can I avoid having to paint the mask again?

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