74 lines
2.7 KiB
Lua
74 lines
2.7 KiB
Lua
--[[ fujifilm_dynamic_range-0.1
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Compensate for Fujifilm raw files made using "dynamic range".
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Copyright (C) 2020 Dan Torop <dant@pnym.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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]]
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--[[About this Plugin
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Support for adjusting darktable exposure by Fujifilm raw exposure
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bias. This corrects for a DR100/DR200/DR400 "dynamic range" setting.
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Dependencies:
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- exiftool (https://www.sno.phy.queensu.ca/~phil/exiftool/)
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Based upon fujifilm_ratings by Ben Mendis
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--]]
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local dt = require "darktable"
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local du = require "lib/dtutils"
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local df = require "lib/dtutils.file"
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local gettext = dt.gettext
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du.check_min_api_version("4.0.0", "fujifilm_dynamic_range")
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gettext.bindtextdomain("fujifilm_dynamic_range", dt.configuration.config_dir.."/lua/locale/")
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local function _(msgid)
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return gettext.dgettext("fujifilm_dynamic_range", msgid)
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end
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local function detect_dynamic_range(event, image)
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-- exiftool knows about the RawExposureBias tag, unlike exiv2, but it is also 10x slower
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if not df.check_if_bin_exists("exiftool") then
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dt.print_error(_("exiftool not found"))
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return
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end
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local RAF_filename = df.sanitize_filename(tostring(image))
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local command = "exiftool -RawExposureBias " .. RAF_filename
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dt.print_error(command)
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output = io.popen(command)
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local raf_result = output:read("*all")
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output:close()
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if string.len(raf_result) > 0 then
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raf_result = string.gsub(raf_result, "^Raw Exposure Bias.-([%d%.%-]+)", "%1")
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if image.exif_exposure_bias ~= image.exif_exposure_bias then
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-- is NAN (this is unlikely as RAFs should have ExposureBiasValue set)
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image.exif_exposure_bias = 0
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end
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-- this should be auto-applied if plugins/darkroom/workflow is scene-referred
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-- FIXME: scene-referred workflow pushes exposure up 0.5 EV, but DR100 pushes up 0.7 EV -- should reduce this by 0.5 EV?
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image.exif_exposure_bias = image.exif_exposure_bias + tonumber(raf_result)
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dt.print_error(_("Using RAF exposure bias: ") .. tostring(raf_result))
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end
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end
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dt.register_event("post-import-image", detect_dynamic_range)
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print(_("fujifilm_dynamic_range loaded."))
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