From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI, T_SCC_BODY_TEXT_LINE,URIBL_SBL_A autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 6548 invoked from network); 29 Jul 2023 01:17:51 -0000 Received: from cgl.ntg.nl (5.39.185.202) by inbox.vuxu.org with ESMTPUTF8; 29 Jul 2023 01:17:51 -0000 Received: from localhost (localhost [127.0.0.1]) by cgl.ntg.nl (Postfix) with ESMTP id 066E748292D for ; Sat, 29 Jul 2023 03:16:03 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at cgl.ntg.nl Received: from cgl.ntg.nl ([127.0.0.1]) by localhost (cgl.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BE5Jf15YU-kZ for ; Sat, 29 Jul 2023 03:16:02 +0200 (CEST) Received: from cgl.ntg.nl (localhost [127.0.0.1]) by cgl.ntg.nl (Postfix) with ESMTP id 56EB54828A2 for ; Sat, 29 Jul 2023 03:15:23 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by cgl.ntg.nl (Postfix) with ESMTP id 199CE4827FF for ; Sat, 29 Jul 2023 03:14:57 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at cgl.ntg.nl Received: from cgl.ntg.nl ([127.0.0.1]) by localhost (cgl.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gNZCvo1AMzMv for ; Sat, 29 Jul 2023 03:14:56 +0200 (CEST) Received: from mail-qv1-f53.google.com (mail-qv1-f53.google.com [209.85.219.53]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by cgl.ntg.nl (Postfix) with ESMTPS id BA26C4827F2 for ; Sat, 29 Jul 2023 03:14:56 +0200 (CEST) Received: by mail-qv1-f53.google.com with SMTP id 6a1803df08f44-637aaaf27f1so2975736d6.0 for ; Fri, 28 Jul 2023 18:14:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1690593294; x=1691198094; h=to:date:message-id:subject:mime-version:content-transfer-encoding :from:from:to:cc:subject:date:message-id:reply-to; bh=lIHa0Lx9zHV39SH6aPjeOd7WPEMRlG8d/LuxpOunPNU=; b=N4C1MIL8mz5wZXmdUrPcZlktIN0qS2BOaDT/dfosR2Ma5erBXWS37Q/Dm07A2xvAJ7 ilhlkKrYxxd9vYPkuDRkNbomik7xwNcQ0PLaSi2vUtIHthNeLfjh9qLCao0SpjF3uJMt hCFZsWB7ZPwNgVoDT7iz6UvJiC2bgd1mfqzkphcUXDCpTRozNHadcJbgA8wKH/WsmJVn Q4TDY2JJPBLKHEKspKI10ljeEwazVQjZjksKdN2gqTdFOn4IYhwn3dfb2AJQUmamD8oH urVXPV0HOLabAzc44RDxlGjXmWyG5+bbfje3IKcp0+VIbjJrdZqbKC2QPWcxgbACnPhh hAuw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690593294; x=1691198094; h=to:date:message-id:subject:mime-version:content-transfer-encoding :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=lIHa0Lx9zHV39SH6aPjeOd7WPEMRlG8d/LuxpOunPNU=; b=UVs0GVUG6+KCekpT8gnArLtlUl7KsMRVL/rlCRV7oS4plGgyj8QXfMtO4tP08Z9yOY jrgrycwtcx5uQD4wiBUBDq8RKk4SgEDyNrLyrnLLBnO0PY2k9Tn4puGzvCezu0B8BmOG TxsoYITwBhJrk/PEzEWTb5wH1169FkqHoJraIZCGNSpnTifHlKgkdrLAHsLZ3kEflhZ5 vHJByKngNbyw/g/Xz2ssvJLA6HJ4tATVRq/RrBzoBiIaNIIIpSAIN3bETgNein+r1+fJ PhzmPbVzOuVD22UVZQL9BLLirUP4yCdfPDYj+I+l+z87JPI9wh7Dg+cH97H+4uE18FAQ MV7w== X-Gm-Message-State: ABy/qLb2XUs3ecg6Pn3VWvTZVCeWE4+Mlgyfe5sqc42QONaWREVbWqBv R4xp4L49Xr4hNBE1mgHuLOMpxDtXazc= X-Google-Smtp-Source: APBJJlEyDH2Sg/pHxvfnnr8EfAMIpPgYUGSlNmSL/br+c2y2FP3LLU3D3sANM/xk6rNPWPFi/z6p6A== X-Received: by 2002:a05:6214:5016:b0:635:da19:a67f with SMTP id jo22-20020a056214501600b00635da19a67fmr1230069qvb.1.1690593292952; Fri, 28 Jul 2023 18:14:52 -0700 (PDT) Received: from smtpclient.apple ([2600:4040:a034:ec00:4d56:c022:88c7:c787]) by smtp.gmail.com with ESMTPSA id e18-20020a0ce3d2000000b00635efe2f65csm1681136qvl.30.2023.07.28.18.14.52 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 28 Jul 2023 18:14:52 -0700 (PDT) From: Benjamin Buchmuller X-Google-Original-From: Benjamin Buchmuller Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.600.7\)) Message-Id: Date: Fri, 28 Jul 2023 21:14:41 -0400 To: mailing list for ConTeXt users X-Mailer: Apple Mail (2.3731.600.7) Message-ID-Hash: 2J4V3AIXFFFOYXCGTYGUBDIXHNPH6INN X-Message-ID-Hash: 2J4V3AIXFFFOYXCGTYGUBDIXHNPH6INN X-MailFrom: benjamin.buchmuller@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list Reply-To: mailing list for ConTeXt users Subject: [NTG-context] =?utf-8?q?Re=3A_setupexternalfigures_and_reso=C4=BAution?= List-Id: mailing list for ConTeXt users Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit This thread about downsampling external images on the fly is a really helpful feature! Thanks, Hraban for sharing the code! I was wondering if it was possible to downscale also raster images embedded in pdf/svg files loaded via \externalfigure? I found a ghostscript solution online (https://stackoverflow.com/questions/9497120/how-to-downsample-images-within-pdf-file) gs \ -o downsampled.pdf \ -sDEVICE=pdfwrite \ -dDownsampleColorImages=true \ -dDownsampleGrayImages=true \ -dDownsampleMonoImages=true \ -dColorImageResolution=72 \ -dGrayImageResolution=72 \ -dMonoImageResolution=72 \ -dColorImageDownsampleThreshold=1.0 \ -dGrayImageDownsampleThreshold=1.0 \ -dMonoImageDownsampleThreshold=1.0 \ input.pdf Now, I'm wondering how to adapt grph-downsample.lua to do this? I've tried: \setupexternalfigure[ resolution=\Resolution, conversion=lowres.pdf ] And added to grph-downsample.lua local function sample_down_pdf(oldname, newname, resolution) print("DOWNSAMPLE sample_down " .. oldname .. " to " .. newname) -- MkIV: -- local image = img.scan{filename = oldname} -- LMTX: local image = figures.getinfo(oldname,1) image = image.status.private local s = format("gs \ -o \"%s\" \ -sDEVICE=pdfwrite \ -dDownsampleColorImages=true \ -dDownsampleGrayImages=true \ -dDownsampleMonoImages=true \ -dColorImageResolution=%s \ -dGrayImageResolution=%s \ -dMonoImageResolution=%s \ -dColorImageDownsampleThreshold=1.0 \ -dGrayImageDownsampleThreshold=1.0 \ -dMonoImageDownsampleThreshold=1.0 \ \"%s\"", oldname, resolution, resolution, resolution, newname) print("DOWNSAMPLE Conversion: " .. s) os.execute(s) end figures.converters["pdf"]["lowres." .. "pdf"] = sample_down_pdf But I must be missing something as the code doesn't seem to be called. Any suggestions? Thanks! Ben ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___________________________________________________________________________________