From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Daniel Fleischer Newsgroups: gmane.emacs.help Subject: Re: Displaying images Date: Sun, 15 Jan 2023 21:27:03 +0200 Message-ID: References: <87r0vwm6f6.fsf@inka.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="880"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: help-gnu-emacs@gnu.org To: "Felix E. 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Klee's message of "Sun, 15 Jan 2023 11:35:41 +0100") Received-SPF: pass client-ip=2a00:1450:4864:20::52d; envelope-from=danflscr@gmail.com; helo=mail-ed1-x52d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:142251 Archived-At: Felix E. Klee [2023-01-15 Sun 11:35] wrote: > * I bought a Sony ZV-1 digital camera, and its ARW raw images don=E2=80= =99t > display. I already have an idea how to solve that, not too > important now. A few words about raw images. These are not really images but the raw sensor data; every pixel and the amount of light it captured. There is no color information. The color comes from filters put on top of the image sensor. The process of converting raw photons counts into RGB pixels is called demosaicing and is very nuanced; you can apply color corrections, remove dead pixels, do noise reduction and the "formulas" are specific for every file format and every camera model and sometimes the lens used. There are specific applications that process raw images, including open source ones. Most of the open source software use either dcraw (CLI tool) or libraw (library). A processing step is needed to convert the raw image into a real image (png,jpg,bmp,tiff, etc). Maybe you can use the CLI tool for fast conversion for preview purposes.=20 --=20 Daniel Fleischer