Picture Investigation

General

# Flickr Image search
https://www.flickr.com/map


# General Engines
https://images.google.com/
https://tineye.com/
https://www.bing.com/?scope=images&nr=1&FORM=NOFORM

# Reverse Russia
https://www.yandex.com/images/

# Reverse China
http://images.baidu.com/


Image Investigation

# EXIF and metadata
http://exif.regex.info/exif.cgi

# Basics Forensics
https://fotoforensics.com/

# Text recognition (OCR)
https://www.newocr.com/

# Stolen Camera Finder
https://www.stolencamerafinder.com/


Deblurring images

# Gaussian Blur
# Install GIMP Plugin "G'MIC"
# Filters>G’MIC>Details>Sharpen (Deblur)
# Pixelize
# The Pixelize blur works by dividing an image into a number of squares 
# and then replacing all the pixels in each square by average of their values.
# For example, if a square has 7 black pixels and 7 white pixels, 
# all the pixels in that square will become gray.

# - Start by applying Gaussian blur, increase radius until pixels disapear.
# - Duplicate layers (Shift+Ctrl+D on Gimp)
# - Filters>Edge detect>Image Gradient
# - Colors>Brightness-Contrast and increase until refined edges
# - Layers tab, \/ icon and choose Soft Light, then adjust.

# Not perfect results but can be ok and recognizable by search engines