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#!/usr/bin/luajit
-- load and save images to and from memory buffers
local vips = require "vips"
if #arg ~= 1 then
print("usage: luajit buffer.lua image-file")
error()
end
local f = assert(io.open(arg[1], "rb"))
local content = f:read("*all")
local im = vips.Image.new_from_buffer(content, "", {access = "sequential"})
-- brighten 20%
im = (im * 1.2):cast("uchar")
-- print as mime jpg
local buffer = im:write_to_buffer(".jpg", {Q = 90})
print("Content-length: " .. #buffer)
print("Content-type: image/jpeg")
print("")
print(buffer)
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