Build output images from Lightroom exports

Makefile

output-jpgs = $(addprefix $1/,$(subst .tif,.jpg,$(wildcard *.tif)))

# $(call transform,quality,convert-args,optim-args)
define transform
	convert $< -quality 98 $2 $@ && \
	jpegoptim $@ -m$1 --all-progressive $3
endef

all: small-jpgs medium-jpgs large-jpgs

small-jpgs: $(call output-jpgs,small)
medium-jpgs: $(call output-jpgs,medium)
large-jpgs: $(call output-jpgs,large)

small/%.jpg: %.tif | small
	$(call transform,87,-resize 1200x,-s)

medium/%.jpg: %.tif | medium
	$(call transform,87,-resize 50% -filter box,-s)

large/%.jpg: %.tif | large
	$(call transform,90,,)

small medium large:
	mkdir -p $@

clean:
	rm -rf small medium large

clean-tifs:
	rm *.tif

# Reset implicit rules
.SUFFIXES:
MAKEFLAGS += --no-builtin-rules