Jpeg compresses an 8x8 pixel block at a time by taking a DCT (which mathematically is lossless, but in practice is not due to rounding and quantization at this stage), which turns those original 8x8 values into another set of 8x8 values, then some of these are thrown away and/or quantized for lossy compression.ĭecompression is the reverse: take these 8x8 quantized DCT coefficients, perform an inverse 8x8 DCT top get pixel values. y offset Pixel-independent offset relative to the choice of alignment on the y-axis.A jpeg pixel is not 64 eight-bit coefficients. x offset Pixel-independent offset relative to the choice of alignment on the x-axis. alignment Use these controls to align the watermark to any edge or the center of the image. Alternatively you can scale the watermark relative to the “larger border” or “smaller border”. The default setting “image” scales the watermark relative to the horizontal image size. scale on The reference for the scale parameter. rotate The rotation angle of the watermark. scale The scale of the watermark, with respect to the option selected in the “scale on” parameter. opacity The opacity of the watermark’s rendering. Fonts can be searched by name and a preview is shown next to the font name. Click on the field to open a dialog box showing the fonts available on your system. text font The font to use (default “DejaVu Sans Book”). Click on the colored field to open a color selector dialog which offers you a choice of commonly used colors, or allows you to define a color in RGB color space. An example is supplied as simple-text.svg.
#DARKTABLE HOW TO SAVE FREE#
text A free text field in which you can enter up to 63 characters to be printed where referenced by the corresponding watermark. The extension of the file (png/svg) is shown in brackets.
#DARKTABLE HOW TO SAVE UPDATE#
Use the reload button to update the list to include any newly-added watermarks.
🔗module controls marker Choose the watermark to apply. $(GPS.LOCATION) All three coordinates (latitude, longitude, elevation) $(GPS.ELEVATION) The image elevation level (meters) $(GPS.LONGITUDE) The image longitude coordinate (E/W 0. $(GPS.LATITUDE) The image latitude coordinate (N/S 0. $(Xmp.dc.rights) The rights assigned to the image Some cameras use this to store shoot-time user-specified text (also called “”). $(Xmp.dc.description) The description of the image. $(DATE.LONG_YEAR) Current system time year $(DATE.SHORT_YEAR) Current system time year (abbreviated) $(DATE.LONG_MONTH) Current system time month localized (January, February. $(DATE.SHORT_MONTH) Current system time month localized (Jan, Feb. $(DATE.MONTH) Current system time month (01. $(DATE.DAY) Current system time day of month (01. $(DATE.HOUR_AMPM) Current system time hours (12, AP/PM)
$(DATE.HOUR) Current system time hours (24h) $(DATE.MINUTE) Current system time minutes $(DATE.SECOND) Current system time seconds
#DARKTABLE HOW TO SAVE FULL#
$(_YEAR) Full year from the image Exif data $(_YEAR) Abbreviated year from the image Exif data (2013 is "13") $(_MONTH) Month from the image Exif data localized (January, February. $(_MONTH) Month from the image Exif data localized (Jan, Feb. $() Day of month from the image Exif data (01. $(_AMPM) Hours from the image Exif data (12h, AM/PM) $(IMAGE.BASENAME) The image file basename $(IMAGE.ID) The unique image id within current library $(WATERMARK_FONT_WEIGHT) The font weight (boldness) $(WATERMARK_FONT_STYLE) The font style (normal, oblique, italic) $(WATERMARK_FONT_FAMILY) The font family to use for $WATERMARK_TEXT $(WATERMARK_COLOR) The color to use for $WATERMARK_TEXT $(WATERMARK_TEXT) A short free text (max. $(DARKTABLE.VERSION) The version of darktable In addition to this list you can also use the variable strings defined in the variables section. The following is a list of variable strings that are supported for substitution within an SVG document. Once in place, use the reload button update the list of available watermarks. User-designed watermarks should be placed into the directory $HOME/.config/darktable/watermarks. The SVG processor in darktable can also substitute strings within an SVG document, allowing image-dependent information to be included in the watermark. Watermarks are standard SVG documents and can be designed using Inkscape. Render a vector-based overlay onto your image.
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