flameshot-org/flameshot

Image has wrong resolution metadata when a vertical monitor is connected

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#3,847 建立於 2025年2月18日

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BugGood first issue

描述

Flameshot Version

Flameshot v12.1.0 (7aa69e4e) Compiled with Qt 5.15.16

flameshot-git from AUR

Installation Type

User repository (AUR)

Operating System type and version

Up to date Arch linux

Description

Images taken with flameshot distorts when I include it in a latex document and compile it with pdflatex or lualatex. It also happens when including a image into a md file and converting it to a PDF using pandoc.

I guess it's some kind of metadata issue as it's fixed when converting the image with convert image.png -strip -density 300 converted.png


Image:
  Filename: image.png
  Permissions: rw-r--r--
  Format: PNG (Portable Network Graphics)
  Mime type: image/png
  Class: DirectClass
  Geometry: 743x345+0+0
  Resolution: 37.8x63.78
  Print size: 19.6561x5.40922
  Units: PixelsPerCentimeter
  Colorspace: sRGB
  Type: TrueColor
  Endianness: Undefined
  Depth: 8-bit
  Channels: 3.0
  Channel depth:
    Red: 8-bit
    Green: 8-bit
    Blue: 8-bit
  Channel statistics:
    Pixels: 256335
    Red:
      min: 0  (0)
      max: 255 (1)
      mean: 23.0503 (0.0903932)
      median: 10 (0.0392157)
      standard deviation: 42.9301 (0.168353)
      kurtosis: 13.1757
      skewness: 3.65033
      entropy: 0.197324
    Green:
      min: 0  (0)
      max: 255 (1)
      mean: 25.0201 (0.0981181)
      median: 14 (0.054902)
      standard deviation: 38.6762 (0.151671)
      kurtosis: 15.2523
      skewness: 3.86002
      entropy: 0.194134
    Blue:
      min: 0  (0)
      max: 255 (1)
      mean: 29.3873 (0.115244)
      median: 18 (0.0705882)
      standard deviation: 40.3997 (0.15843)
      kurtosis: 15.3
      skewness: 3.90189
      entropy: 0.197515
  Image statistics:
    Overall:
      min: 0  (0)
      max: 255 (1)
      mean: 25.8192 (0.101252)
      median: 14 (0.054902)
      standard deviation: 40.6686 (0.159485)
      kurtosis: 14.576
      skewness: 3.80408
      entropy: 0.196324
  Rendering intent: Perceptual
  Gamma: 0.454545
  Chromaticity:
    red primary: (0.64,0.33,0.03)
    green primary: (0.3,0.6,0.1)
    blue primary: (0.15,0.06,0.79)
    white point: (0.3127,0.329,0.3583)
  Matte color: grey74
  Background color: white
  Border color: srgb(223,223,223)
  Transparent color: black
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 743x345+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Zip
  Orientation: Undefined
  Properties:
    date:create: 2025-02-18T12:11:40+00:00
    date:modify: 2025-02-18T12:11:40+00:00
    date:timestamp: 2025-02-18T12:26:50+00:00
    png:IHDR.bit-depth-orig: 8
    png:IHDR.bit_depth: 8
    png:IHDR.color-type-orig: 2
    png:IHDR.color_type: 2 (Truecolor)
    png:IHDR.interlace_method: 0 (Not interlaced)
    png:IHDR.width,height: 743, 345
    png:pHYs: x_res=3780, y_res=6378, units=1
    signature: a3e6009196e99ea777bf3317f511c192997a9cc22760dcd73bbe1e2d0bb6c5b2
  Artifacts:
    verbose: true
  Tainted: False
  Filesize: 34775B
  Number pixels: 256335
  Pixel cache type: Memory
  Pixels per second: 64.9518MP
  User time: 0.000u
  Elapsed time: 0:01.003
  Version: ImageMagick 7.1.1-43 Q16-HDRI x86_64 22550 https://imagemagick.org

Image:
  Filename: converted.png
  Permissions: rw-r--r--
  Format: PNG (Portable Network Graphics)
  Mime type: image/png
  Class: DirectClass
  Geometry: 743x345+0+0
  Units: Undefined
  Colorspace: sRGB
  Type: TrueColor
  Endianness: Undefined
  Depth: 8-bit
  Channels: 3.0
  Channel depth:
    Red: 8-bit
    Green: 8-bit
    Blue: 8-bit
  Channel statistics:
    Pixels: 256335
    Red:
      min: 0  (0)
      max: 255 (1)
      mean: 23.0503 (0.0903932)
      median: 10 (0.0392157)
      standard deviation: 42.9301 (0.168353)
      kurtosis: 13.1757
      skewness: 3.65033
      entropy: 0.197324
    Green:
      min: 0  (0)
      max: 255 (1)
      mean: 25.0201 (0.0981181)
      median: 14 (0.054902)
      standard deviation: 38.6762 (0.151671)
      kurtosis: 15.2523
      skewness: 3.86002
      entropy: 0.194134
    Blue:
      min: 0  (0)
      max: 255 (1)
      mean: 29.3873 (0.115244)
      median: 18 (0.0705882)
      standard deviation: 40.3997 (0.15843)
      kurtosis: 15.3
      skewness: 3.90189
      entropy: 0.197515
  Image statistics:
    Overall:
      min: 0  (0)
      max: 255 (1)
      mean: 25.8192 (0.101252)
      median: 14 (0.054902)
      standard deviation: 40.6686 (0.159485)
      kurtosis: 14.576
      skewness: 3.80408
      entropy: 0.196324
  Rendering intent: Perceptual
  Gamma: 0.454545
  Chromaticity:
    red primary: (0.64,0.33,0.03)
    green primary: (0.3,0.6,0.1)
    blue primary: (0.15,0.06,0.79)
    white point: (0.3127,0.329,0.3583)
  Matte color: grey74
  Background color: white
  Border color: srgb(223,223,223)
  Transparent color: black
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 743x345+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Zip
  Orientation: Undefined
  Properties:
    date:create: 2025-02-18T12:16:52+00:00
    date:modify: 2025-02-18T12:16:52+00:00
    date:timestamp: 2025-02-18T12:28:31+00:00
    png:IHDR.bit-depth-orig: 8
    png:IHDR.bit_depth: 8
    png:IHDR.color-type-orig: 2
    png:IHDR.color_type: 2 (Truecolor)
    png:IHDR.interlace_method: 0 (Not interlaced)
    png:IHDR.width,height: 743, 345
    signature: a3e6009196e99ea777bf3317f511c192997a9cc22760dcd73bbe1e2d0bb6c5b2
  Artifacts:
    verbose: true
  Tainted: False
  Filesize: 34581B
  Number pixels: 256335
  Pixel cache type: Memory
  Pixels per second: 63.0047MP
  User time: 0.000u
  Elapsed time: 0:01.004
  Version: ImageMagick 7.1.1-43 Q16-HDRI x86_64 22550 https://imagemagick.org

Steps to reproduce

Download: as image.png Image

run convert image.png -strip -density 300 converted.png on that image or download: as converted.png Image

create a main.tex file with the content:


\documentclass{article}
\usepackage{graphicx}
\begin{document}
\begin{figure}
    \includegraphics[width=0.9\linewidth]{image.png}
    \caption{original}
\end{figure}

\begin{figure}
    \includegraphics[width=0.9\linewidth]{converted.png}
    \caption{Converted}
\end{figure}
    

\end{document}

run lualatex main.tex the resulting PDF has one distorted and one correct image

Alternative using pandoc:

Create a md file containing:

![alt text](converted.png)
![alt text](image.png)

and run pandoc test.p.md -o test.p.pdf

Screenshots or screen recordings

Latex Output Image

Pandoc Output Image

System Information

operating System

Arch linux 6.13.2-arch1-1

Monitor Config

Image

DP-0 connected 1080x1920+5760+120 left (normal left inverted right x axis y axis) 527mm x 296mm DP-2 connected 1920x1080+0+540 (normal left inverted right x axis y axis) 527mm x 296mm DP-4 connected primary 3840x2160+1920+0 (normal left inverted right x axis y axis) 710mm x 400mm

Windows manager

Xorg, Qtile

貢獻者指南

技術棧
cpp
領域
desktop
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
half day
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
fresh
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
C++QtPNG format
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
65
研究方向
Investigate how Flameshot sets the physical resolution (DPI) in saved PNG images. Look for where the 'pHYs' chunk is written, likely in the screenshot saving code. The issue suggests that when a vertical monitor is connected, the resolution values (x res and y res) are incorrect, possibly due to using monitor dimensions without considering rotation. Check the code that determines the display's physical dimensions and ensure the resolution is correctly derived from the monitor's geometry.